Just one point still separates Pennsylvania Sen. Arlen Specter (D) and his Republican challenger for re-election Pat Toomey, the former congressman and Club for Growth head. Both find themselves leading Rep. Joe Sestak (D-Pa.), according to a Quinnipiac poll released today (Sept. 22-28, 1100 RV, MoE +/- 3%).

Specter's margin over Sestak in the primary has dropped 13 points since the July 22 poll, while Toomey's small lead over Sestak in the general election is practically unchanged.

More than half of voters still haven't heard of Toomey, while 70% don't know Sestak. Specter, who has a 90% name ID, is viewed favorably by 42% and unfavorably by 46% -- his first upside down favorable rating in at least a year.

Dem Primary
Specter 44
Sestak 25
Und 28

Specter leads by 18.2 points in the RCP Average

General Election
Toomey 43
Specter 42
Und 13

Toomey and Specter are tied in the RCP Average

Toomey 38
Sestak 35
Und 25

Toomey leads by 3.5 points in the RCP Average

"Toomey and Specter are neck and neck in what could be a 13-month horse race," said Quinnipiac pollster Peter Brown. "The challenger's ability to close the 53 - 33 percent gap in Quinnipiac University's May 4 poll is evidence that the longtime senator's decision to switch parties to avoid a potential loss to Toomey in a GOP primary may not be the magic bullet for reelection that he had hoped it would be."