A new Rasmussen poll in Pennsylvania finds that both the newly-Democratic Sen. Arlen Specter and his primary challenger, Rep. Joe Sestak, lead Republican former Rep. Pat Toomey for the 2010 Senate general election.

The numbers: Specter is ahead of Toomey 50%-39%, while Sestak leads Toomey 41%-35%, with the higher undecided numbers presumably coming from Sestak having lower name recognition than Specter with his nearly 30 years in the Senate. The margin of error is ±4.5%.

Specter has a favorable rating of 53%, to 43% unfavorable. Sestak's favorable ratings are 42%-33%, and Toomey's are at 50%-35%.