PHILADELPHIA, PA (AP) - U.S. Sen. Arlen Specter has been defeated in a Pennsylvania primary in his bid for a sixth term after taking the risky step of switching to the Democratic Party.
Voters Tuesday picked U.S. Rep. Joe Sestak as the party's nominee and rejected the 80-year-old Specter in his first Democratic campaign.
The vote also was a defeat for President Barack Obama, who supported Specter when he abandoned the Republican Party last year.
The moderate Specter cast his switch as a decision of principle after inflaming the GOP by voting for Obama's economic stimulus bill.
But many Democratic voters questioned his motives.
Sestak faces Republican Pat Toomey in the fall election.