ABC News' Sunlen Miller Reports: Calling it a lengthy primary season, Sen. Barack Obama, D-Ill., offered a Pittsburgh, Pa. crowd an analogy on the Democratic primary race, saying it is like "a good movie that lasted about a half an hour too long."
Obama said he and Sen. Hillary Clinton, D-N.Y., have been running in the Democratic primary so long that they could reverse roles and recite each others' lines without missing a beat.
"I think there are some people who felt like, 'God, when will this be over?'" he said.
Obama added that the lengthy campaign has been tough because both he and Clinton understand what's at stake during the campaign.
One of Obama's top supporters, Sen. Patrick Leahy, D-Vt., told a radio station today he thought Clinton should get out of the race.
Obama picked up an endorsement Friday from Pennsylvania Democratic Sen. Bob Casey, who said he called Clinton last night to let her know. Casey said she was gracious with his decision to support Obama.
Casey told reporters that he didn’t quite agree with Leahy’s assertion that Clinton should withdraw, but did say he hopes the end of the primary draws near.
"I would hope that after Pennsylvania, then we got a couple more primaries, I would hope this wouldn’t go much further beyond the end of May," Casey said. "I think we would be better off having a nominee in the time period, certainly in late May or early June, that would be ideal. Because if you get too far into the summer, I think positions begin to harden and we lose time to not just unite and bring people together but we are also giving the Republican nominee more time to make the case against our nominees without having enough rebuttal."
Obama kicked off his six-day bus tour throughout Pennsylvania with former Pittsburgh Steeler Jerome Bettis, nicknamed "the bus" and Franco Harris, a retired Pittsburgh Steelers player in the football Hall of Fame.
Obama posed for pictures with the football players and waved a rally towel in the air above his head to fans in the streets before getting on the bus, off to the next campaign stop.