2010 Senate Forecast
Simulation Model
Registered and Likely Voter
Projections
The
House and Senate forecast models provide Registered Voter (RV) and Likely Voter
(LV) projections. The assumption is that the election is held today. Pre-election polls all interview registered voters; likely
voters are a sub-sample. They are not
separate polls. Democrats always do better in the full RV sample than in the
Since 2000,
Midterm Forecast
(Probability of GOP majority)
Senate Seats
(200 simulated election trials)
RV polls: Dem 52.7 - Repub 45.3 (0%)
The media/pollster drumbeat of a
“horse race” is largely based on
The
2010 midterms are different from the last four elections in that a low
Democratic voter turnout is expected. Election fraud will very likely cost the
Democrats a few seats in the House and Senate. And the number will be close to
the difference between the RV and
For the
Senate races polling websites generally display only
In the House,
Generic polls have had a more equitable mix of RV and
The Fraud Component
In 2004, 2006 and 2008, projections based on final
pre-election
Pre-election Model:
Recorded vote share =
Post-election Model:
Recorded vote share = Final Exit Poll =
Unadjusted exit poll + Fraud component
Applying the formula
to the latest Senate and House Generic Polls:
Projected GOP Senate Vote Share:
Share = 52.4
= 50.5 + Fraud component
Fraud
component = 1.9% (3.8% margin).
The Likely Voter Cutoff
Model (LVCM)
In 2004, there were 22 million voters who did
not vote in 2000. Nearly 60% of newly registered voters were Democrats for
Kerry. In the 2006 midterms, a Democratic tsunami gave them control of both
houses. In 2008, there were approximately 15 million new voters of whom 70%
voted for Obama. All pre-election polls interview
registered voters. Likely Voter (LV) polls are a subset of the full Registered
Voter (RV) sample.
Most pollsters use the Likely Voter Cutoff Model (LVCM),
a series of questions regarding past voting history, residential transience,
intent to vote, etc. Since students, transients, low-income voters, immigrant
new voters, etc. are much more likely to give "No" answers than
established, wealthier, non-transient voters, Republicans are more likely to
exceed the cutoff than Democrats. A respondent who indicates “yes” to four out
of seven questions might be down-weighted to 50% compared to one who answers “yes”
to all seven.
The
LVCM assigns a weight of zero to all respondents falling below the
cutoff, eliminating them from the sample. But
these potential voters have more than a zero probability of voting. The
number of "Yes" answers required to qualify as a likely voter is set
based on how the pollster wants the sample to turn out. The more Republicans the
pollster wants in the sample, the more "Yes" answers are required.
This serves to eliminate many Democrats and skews the sample to the GOP.
Undecided Voters, Turnout and Final Exit Polls
In
1988, 11 million votes were uncounted; in 2000, 6 million; in 2004, 4 million;
in 2006, 3 million.
In 2004, 2006 and 2008, projections
based on final pre-election
Final exit polls are always
forced to match the
recorded vote count (i.e. the final pre-election
Once again, as in every election cycle, the media avoids the real issues.
Martha Coakley won the hand-counts in
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Senate
Forecast Simulation |
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http://www.realclearpolitics.com/epolls/latest_polls/senate/ |
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26-Sep |
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Dem |
GOP |
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Fraud |
0.0% |
Vote
share deviation |
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Current
seats |
57 |
41 |
2 |
MoE |
4.0% |
Poll
margin of error |
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UVA |
50.0% |
Undecided
voter allocation to GOP |
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Polls |
Type |
Avg Vote Share |
Undec |
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12 |
RV |
47.8 |
41.1 |
11.1 |
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25 |
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38.6 |
51.6 |
9.8 |
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37 |
RV/LV |
41.6 |
48.2 |
10.2 |
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Simulation
Forecast (seats) |
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Projection
(table) |
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37 |
RV/LV |
52.7 |
45.3 |
2 |
RV/LV |
Dem |
GOP |
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Net
Gain |
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- |
4.3 |
- |
Seats |
54 |
44 |
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Win
Probability |
100.0% |
0.0% |
- |
Flip
to |
1 |
4 |
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Seats |
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50.5 |
47.5 |
2 |
Lean |
4 |
3 |
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Net
Gain |
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- |
6.5 |
- |
Safe |
7 |
16 |
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Win
Probability |
95.0% |
5.0% |
- |
Tossup |
7 |
0 |
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*
tossup |
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Wtd Share % |
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Projected
% |
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GOP |
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Poll |
Seat |
Type |
Dem |
GOP |
Unsure |
Margin |
Dem |
GOP |
Margin |
Win Prob |
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Within |
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26-Sep |
Held |
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42.5 |
47.2 |
10.3 |
4.7 |
47.6 |
52.4 |
4.7 |
5.0% |
Flip |
MoE |
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Average |
By |
RV/LV |
44.0 |
45.1 |
10.8 |
1.1 |
49.5 |
50.5 |
1.1 |
0.0% |
5 |
14 |
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AK |
R |
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42 |
48 |
10 |
6 |
47.0 |
53.0 |
6.0 |
93% |
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AK |
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R |
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30 |
59 |
11 |
29 |
35.5 |
64.5 |
29.0 |
100% |
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D |
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34 |
54 |
12 |
20 |
40.0 |
60.0 |
20.0 |
100% |
GOP |
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R |
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31 |
53 |
16 |
22 |
39.0 |
61.0 |
22.0 |
100% |
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D |
|
51 |
43 |
6 |
(8) |
54.0 |
46.0 |
(8.0) |
2% |
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CA |
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D* |
RV |
47 |
44 |
9 |
(3) |
51.5 |
48.5 |
(3.0) |
23% |
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CO |
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D |
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52 |
45 |
3 |
(7) |
53.5 |
46.5 |
(7.0) |
4% |
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CT |
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D |
RV |
59 |
34 |
7 |
(25) |
62.5 |
37.5 |
(25.0) |
0% |
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R* |
RV |
34 |
36 |
30 |
2 |
49.0 |
51.0 |
2.0 |
69% |
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FL |
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R |
|
34 |
52 |
14 |
18 |
41.0 |
59.0 |
18.0 |
100% |
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D |
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68 |
20 |
12 |
(48) |
74.0 |
26.0 |
(48.0) |
0% |
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R |
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35 |
55 |
10 |
20 |
40.0 |
60.0 |
20.0 |
100% |
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R |
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27 |
64 |
9 |
37 |
31.5 |
68.5 |
37.0 |
100% |
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D* |
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41 |
44 |
15 |
3 |
48.5 |
51.5 |
3.0 |
77% |
GOP |
IL |
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D |
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29 |
50 |
21 |
21 |
39.5 |
60.5 |
21.0 |
100% |
GOP |
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R |
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23 |
67 |
10 |
44 |
28.0 |
72.0 |
44.0 |
100% |
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R* |
RV |
46 |
46 |
8 |
0 |
50.0 |
50.0 |
0.0 |
50% |
Dem |
KY |
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R |
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33 |
54 |
13 |
21 |
39.5 |
60.5 |
21.0 |
100% |
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D |
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55 |
39 |
6 |
(16) |
58.0 |
42.0 |
(16.0) |
0% |
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R |
RV |
41 |
54 |
5 |
13 |
43.5 |
56.5 |
13.0 |
100% |
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R |
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36 |
56 |
8 |
20 |
40.0 |
60.0 |
20.0 |
100% |
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D |
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25 |
69 |
6 |
44 |
28.0 |
72.0 |
44.0 |
100% |
GOP |
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R |
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44 |
49 |
7 |
5 |
47.5 |
52.5 |
5.0 |
89% |
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NH |
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D |
RV |
42 |
34 |
24 |
(8) |
54.0 |
46.0 |
(8.0) |
2% |
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NV |
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D |
RV |
57 |
31 |
12 |
(26) |
63.0 |
37.0 |
(26.0) |
0% |
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D |
RV |
63 |
30 |
7 |
(33) |
66.5 |
33.5 |
(33.0) |
0% |
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R |
RV |
42 |
49 |
9 |
7 |
46.5 |
53.5 |
7.0 |
96% |
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OH |
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R |
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24 |
67 |
9 |
43 |
28.5 |
71.5 |
43.0 |
100% |
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D |
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54 |
37 |
9 |
(17) |
58.5 |
41.5 |
(17.0) |
0% |
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D* |
RV |
45 |
45 |
10 |
0 |
50.0 |
50.0 |
0.0 |
50% |
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PA |
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SC |
R |
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30 |
70 |
0 |
40 |
30.0 |
70.0 |
40.0 |
100% |
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SD |
R |
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30 |
70 |
0 |
40 |
30.0 |
70.0 |
40.0 |
100% |
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UT |
R |
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25 |
52 |
23 |
27 |
36.5 |
63.5 |
27.0 |
100% |
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D |
RV |
50 |
44 |
6 |
(6) |
53.0 |
47.0 |
(6.0) |
7% |
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WA |
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VT |
D |
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64 |
29 |
7 |
(35) |
67.5 |
32.5 |
(35.0) |
0% |
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D* |
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48 |
46 |
6 |
(2) |
51.0 |
49.0 |
(2.0) |
31% |
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WI |
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D* |
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47 |
45 |
8 |
(2) |
51.0 |
49.0 |
(2.0) |
31% |
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WV |
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Probability
Distribution of GOP Net Gains |
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Majority |
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Gain |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
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Seats |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
49 |
50 |
51 |
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Probability |
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Exact |
0.0% |
0.0% |
0.0% |
1.0% |
5.0% |
17.5% |
25.0% |
37.0% |
9.5% |
5.0% |
0.0% |
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At
least |
100.0% |
100.0% |
100.0% |
100.0% |
99.0% |
94.0% |
76.5% |
51.5% |
14.5% |
5.0% |
0.0% |
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Projection Trend |
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RV/LV |
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Simulation |
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Simulation |
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Vote
Share |
GOP
Gain |
Vote
Share |
GOP
Gain |
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Dem |
GOP |
Seats |
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Dem |
GOP |
Seats |
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26-Aug |
49.0 |
51.0 |
6.2 |
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50.5 |
49.5 |
4.4 |
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1-Sep |
48.2 |
51.8 |
8.0 |
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49.5 |
50.5 |
6.0 |
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10-Sep |
47.9 |
52.1 |
7.3 |
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49.6 |
50.4 |
5.3 |
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15-Sep |
47.8 |
52.2 |
6.7 |
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49.3 |
50.7 |
4.3 |
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26-Sep |
47.6 |
52.4 |
6.5 |
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49.5 |
50.5 |
4.3 |
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GOP Forecast
Sensitivity to Undecided Voter Allocation and Poll Type |
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GOP |
Vote
Share % |
Seats
(table) |
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Seats
(simulation) |
Net
Gain |
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UVA |
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RV/LV |
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RV/LV |
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RV/LV |
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RV/LV |
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40% |
51.3 |
49.5 |
47 |
42 |
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46.3 |
43.5 |
5.3 |
2.5 |
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45% |
51.8 |
50.0 |
48 |
43 |
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47.0 |
44.3 |
6.0 |
3.3 |
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50% |
52.4 |
50.5 |
48 |
44 |
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47.5 |
45.3 |
6.5 |
4.3 |
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55% |
52.9 |
51.1 |
48 |
46 |
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48.0 |
46.1 |
7.0 |
5.1 |
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60% |
53.4 |
51.6 |
48 |
46 |
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48.6 |
46.7 |
7.6 |
5.7 |
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GOP Forecast
Sensitivity to Undecided Voter Allocation and Vote Switch |
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RV/LV |
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Vote
switch |
Undecided
Voter Allocation to GOP |
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to GOP |
40% |
45% |
50% |
55% |
60% |
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
GOP
Net Gain |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0% |
1 |
2 |
3 |
5 |
5 |
|
|
|
|
|
|
|
|
|
|
|
1% |
3 |
5 |
5 |
7 |
8 |
|
|
|
|
|
|
|
|
|
|
|
2% |
6 |
8 |
8 |
8 |
9 |
|
|
|
|
|
|
|
|
|
|
|
3% |
8 |
8 |
8 |
10 |
10 |
|
|
|
|
|
|
|
|
|
|
|
4% |
10 |
10 |
10 |
12 |
12 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
Seats |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0% |
42 |
43 |
44 |
46 |
46 |
|
|
|
|
|
|
|
|
|
|
|
1% |
44 |
46 |
46 |
48 |
49 |
|
|
|
|
|
|
|
|
|
|
|
2% |
47 |
49 |
49 |
49 |
50 |
|
|
|
|
|
|
|
|
|
|
|
3% |
49 |
49 |
49 |
51 |
51 |
|
|
|
|
|
|
|
|
|
|
|
4% |
51 |
51 |
51 |
53 |
53 |
|
|
|
|
|
|
|
|
|