Republican Pat Toomey and Democrat Joe Sestak have very little in common, except for two core beliefs: They both think Pennsylvania's Republican turned Democrat Arlen Specter is doing a...

Progressive online activists prefer Rep. Joe Sestak over Sen. Arlen Specter by a landslide margin.

In Pennsylvania, party-switching Arlen Specter seems to be the prohibitive favorite to win the nomination of his new Democratic colleagues. But don't count out Joe Sestak

Party-switching Arlen Specter seems to be the prohibitive favorite to win the nomination of his new Democratic colleagues. But don't count out Joe Sestak

U.S. Rep. Joe Sestak plans to take on the no-longer-Republican senator in the Pennsylvania primary. But Obama has promised to campaign for Specter. Rep. Joe Sestak (D-Pa.), who...