Voters in Rep. Joe Sestak's (D) district prefer Sestak by a three-point margin over Republican Pat Toomey in the Keystone State's Senate race.

Forty-nine percent of voters in the state's 7th congressional district said they plan to support Sestak for Senate, compared to 46 percent who plan to vote for Toomey. Five percent were undecided or planned to vote for another candidate.

Sestak's lead in his own district is well within the margin of error of the Monmouth University poll of the district released Thursday. The poll suggests that Sestak, the two-term congressman who beat Sen. Arlen Specter (D) to snag the party's Senate nomination this cycle, is beginning to fall behind in his race against Toomey — even in his own home base.

Statewide polls suggest an advantage presently for Toomey, the former congressman and former chairman of the Club for Growth, an economically conservative advocacy group.

A poll conducted Sept. 28-Oct. 4 for the Allentown Morning Call and Muhlenberg College found Toomey leading Sestak 45-38 percent, with a 4 percent margin of error.

The Monmouth poll was conducted Oct. 4-6 and has a 3.8 percent margin of error.