Pennsylvania
4-20/21
4-19/20
4-18/19
4-17/18
4-16/17
4-15/16

Clinton
51%
48%
46%
47%
47%
45%

Obama
41%
42%
43%
42%
43%
44%

Someone else
3%
4%
3%
3%
2%
3%

Not sure
6%
6%
8%
8%
8%
9%
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Meanwhile, 6% remained undecided and another 3% said they preferred someone else in the two-day tracking poll. It was conducted April 20-21, 2008, using live operators working out of Zogby's on-site call center in Upstate New York, included 675 likely Democratic primary voters in Pennsylvania. It carries a margin of error of +/- 3.8 percentage points.
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