MUHLENBERG COLLEGE /MORNING CALL
2010 Pennsylvania Democratic Primary Tracking Poll
RELEASE #11– May 12, 2010
FIELDING PERIOD – May 8-11, 2010
SAMPLE – 407 Democratic Likely Voters in Pennsylvania
MARGIN OF ERROR - +/- 5% at 95% Level of Confidence
TOTALS MAY NOT EQUAL 100% DUE TO ROUNDING
METHODOLOGY: Beginning on May 2, 2010 and ending on May 16, 2010, The
Muhlenberg College Institute of Public Opinion and the Morning Call will be releasing
daily results from their statewide Democratic primary tracking poll. The results are
drawn from telephone surveys of likely Democratic voters in the Commonwealth of
Pennsylvania. Each day’s release will be based on the results of interviews conducted
during the previous four days. For example, the initial release on Sunday, May 2nd was
produced from interviews conducted between April 28th and May 1st. While the total
sample size will alternate from day to day because of varying completion rates, the
average sample sizes will be approximately 400. Precise margins of error will be
identified with each release and average around +/-5% at a 95% level of confidence.
All interviews will be conducted by individuals who have been trained in standard
interviewing procedures. The sampling frame for this research is a list of registered
democratic voters from the Commonwealth of Pennsylvania. To determine if an
individual is a likely voter the Muhlenberg College/Morning Call poll uses a three step
process. First, the individual must be registered to vote as a Democrat in the
Commonwealth of Pennsylvania. This is validated through the use of registered voting
records. Second, the individual must identify their likelihood of voting in the May, 2010
election as either “definite” or “very likely.” Finally, the individual must have voted in
the last mid-term election in which they were eligible to vote. For example, if voter was
registered during the last mid-term election in 2006, voted in that election, and is
currently registered as a Democrat in Pennsylvania they are included in the sampling
frame for the study.
If an individual meets these three requirements they are identified as a likely voter. If
they do not meet all three of the requirements they are excluded from participation. All
registered Democratic voters who meet the likely voter criteria specified above have an
equal chance of being selected for inclusion in the poll. Voters are chosen at random
through a computerized selection process.
The data gathered through our interviewing process is statistically weighted to insure that
the sample reflects the primary voters in terms of age, race, gender and region of the state.
The weighting process is required because different segments of the population respond
to interview requests in different ways. For example, women answer the phone more than
men and older individuals are more likely to be reached than their younger counterparts
TRACKING POLL RESULTS –MAY 12, 2010
Key Findings
1. Incumbent Arlen Specter and Congressman Joe Sestak are tied in the race to
garner the Democratic Party nomination for the United States Senate.
2. Allegheny County executive Dan Onorato holds a 22 point lead over his nearest
challenger State Senator Anthony Williams in the race to be the Democratic Party
nominee for Pennsylvania Governor.
Senate Race (Including Leaners)
Specter
Sestak
Other/Not
Sure
5/02
48%
42%
11%
5/03
49%
40%
11%
5/04
46%
42%
12%
5/05
48%
40%
11%
5/06
45%
40%
14%
5/07
43%
43%
13%
5/08
42%
44%
14%
5/09
42%
46%
12%
5/10
42%
47%
11%
5/11
43%
47%
10%
5/12
45%
45%
9%
5/10
35%
10%
8%
15%
32%
5/11
33%
9%
10%
15%
34%
5/12
37%
9%
8%
15%
30%
Governor’s Race (Including Leaners)
Onorato
Wagner
Hoeffel
Williams
Other/Not
Sure
5/02
41%
5%
6%
8%
40%
5/03
39%
6%
7%
7%
41%
5/04
36%
8%
9%
9%
38%
5/05
34%
8%
11%
9%
37%
5/06
34%
9%
12%
8%
39%
5/07
35%
8%
11%
10%
36%
5/08
35%
8%
10%
9%
38%
5/09
36%
8%
8%
12%
36%
Favorability Ratings for Senatorial and Government Candidates
Arlen Specter
5/02 5/03 5/04
Favorable
58% 58% 55%
Unfavorable 31% 32% 33%
Not Sure
10% 10% 12%
5/05
57%
29%
14%
5/06
56%
30%
13%
5/07
54%
34%
13%
5/08
52%
34%
14%
5/09
50%
36%
14%
5/10
52%
35%
13%
5/11
52%
34%
15%
5/12
54%
35%
12%
Joe Sestak
5/02
Favorable
45%
Unfavorable 12%
Not Sure
44%
5/03
43%
12%
45%
5/04
45%
11%
44%
5/05
42%
14%
45%
5/06
44%
13%
43%
5/07
48%
13%
39%
5/08
51%
14%
35%
5/09
52%
13%
35%
5/10
55%
14%
31%
5/11
56%
10%
33%
5/12
55%
9%
36%
5/03
42%
6%
52%
5/04
42%
6%
52%
5/05
40%
10%
51%
5/06
38%
10%
52%
5/07
40%
11%
49%
5/08
38%
10%
52%
5/09
39%
9%
51%
5/10
42%
11%
48%
5/11
40%
11%
49%
5/12
44%
13%
43%
5/02 5/03 5/04
Favorable
21% 19% 22%
Unfavorable 11% 11% 10%
Not Sure
68% 70% 68%
5/05
19%
7%
74%
5/06
19%
8%
74%
5/07
19%
7%
75%
5/08
18%
6%
76%
5/09
17%
8%
74%
5/10
19%
10%
71%
5/11
17%
9%
74%
5/12
20%
10%
70%
5/05
19%
12%
70%
5/06
18%
11%
71%
5/07
20%
12%
67%
5/08
21%
14%
65%
5/09
24%
13%
64%
5/10
26%
15%
60%
5/11
28%
13%
60%
5/12
26%
13%
61%
5/05
25%
7%
67%
5/06
22%
8%
70%
5/07
21%
8%
70%
5/08
20%
8%
71%
5/09
18%
8%
74%
5/10
21%
9%
71%
5/11
22%
7%
71%
5/12
21%
6%
72%
Dan Onorato
5/02
Favorable
45%
Unfavorable 5%
Not Sure
49%
Jack Wagner
Anthony Williams
5/02 5/03 5/04
Favorable
18% 16% 18%
Unfavorable 14% 13% 13%
Not Sure
68% 71% 69%
Joe Hoeffel
5/02
Favorable
23%
Unfavorable 7%
Not Sure
69%
5/03
22%
8%
70%
5/04
25%
8%
66%