VARIOUS (AP) - Pennsylvania Sen. Arlen Specter has been defeated in a primary in his bid for a sixth term after taking the risky step of switching to the Democratic Party.
Voters yesterday picked Rep. Joe Sestak as the party's nominee, and rejected the 80-year-old Specter in his first Democratic campaign.
Sestak faces Republican Pat Toomey in the fall election.
In Kentucky, Rand Paul says his win in the Republican primary for a Senate nomination is a "tremendous mandate for the tea party."
Paul, a political newcomer, beat Republican establishment favorite Trey Grayson.
The victory gives a tea party activist a key win in a statewide election that could embolden the fledgling political movement in other states.
In Arkansas, Democratic Sen. Blanche Lincoln was forced into a potentially debilitating June runoff election against Lt. Gov. Bill Halter in her bid for nomination to a third term.
Rep. John Boozman won the Republican line on the ballot outright.