Left: Rep. Joe Sestak, D-Pa., along with his daughter, Alex, celebrate at a primary night watch event at the Valley Forge Military Academy & College in Wayne, Pa., Tuesday, May 18, 2010. (AP Photo/Michael Perez) Right: Sen. Arlen Specter, D-Pa., with his wife Joan by his side, addresses supporters at an election night party in Philadelphia, Tuesday, May 18, 2010. (AP Photo/Jacqueline Larma)
May 19, 2010 7:10:32 AM PDT
By MARC LEVY
PHILADELPHIA (AP) - May 19, 2010 --
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.