On May 18th, Pennsylvania Democrats will pick who they want on the ballot for the U.S. Senate seat up for election in November. They will see one familiar name in an unfamiliar setting: sitting Senator Arlen Specter, the longest-serving U.S. Senator in Pennsylvania’s history, a longtime Republican who switched parties last year and has the backing of most major national and state Democratic leaders. And voters will also see one name far less familiar, that of JOE SESTAK. He’s the Democrat representing Pennsylvania’s Seventh Congressional District in Delaware and Chester counties since 2006. And if opinion polls show him gaining ground on Specter as the high-stakes primary approaches. On today’s Radio Times, Marty will talk to Joe Sestak about why he’s running for Senate, and why he should win the Democratic nomination over Arlen Specter.