Muhlenberg (pdf): for Allentown Morning Call (10/16-19, likely voters, 9/28-10/4 in parens):
Joe Sestak (D): 44 (38)
Pat Toomey (R): 41 (45)
Undecided: 15 (14)
Dan Onorato (D): 40 (37)
Tom Corbett (R): 47 (47)
Undecided: 14 (16)
(MoE: ±5%)
As you probably recall, yesterday PPP came out with a poll giving Joe Sestak a one-point lead over Pat Toomey, in marked contrast to, well, everyone else; at that point, it was too early to declare "game changer" without confirmation from someone else. Well, we didn't have to wait very long at all: Muhlenberg is out with the first installment in what will be a daily tracker until the election, and it has Sestak leading by 3. (Which leads to the question: most effective poop-themed ad ever?) Remember that Muhlenberg's tracker during the primary steadily showed Sestak emerging into view and overtaking Arlen Specter at the end. It looks like we're seeing something remarkably similar.
Impressively, it's still a pretty GOP-friendly sample, with respondents identifying as 46% Dem, 46% GOP, 8% indie (in a state with a sizable Dem registration advantage), and with 42/51 Barack Obama approvals. The gubernatorial race also shows some improvement, though not enough to cause anyone to rethink that race the way we'll have to regarding the Senate race. Also importantly, there's significant tightening on the House generic ballot in Pennsylvania: 44-39 for the GOP, down from 48-36 several weeks ago. If that keeps up, that probably makes the difference in terms of several House seats, in a state where we could potentially lose five or more.