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(CNN) -- Sen. Hillary Clinton embraced the role of underdog and vowed not to quit as she and her rival in the Democratic presidential contest, Sen. Barack Obama, stumped across Pennsylvania on Tuesday.


Sen. Hillary Cinton said Tuesday in Philadelphia, Pennsylvania, that she won't drop out of the race.

Entering to the theme song from the "Rocky" movies, Clinton compared herself to Rocky Balboa, the boxing hero played by Sylvester Stallone, during an address to the AFL-CIO in Philadelphia, Pennsylvania.

"Sen. Obama says he's getting tired of the campaign. His supporters say they want it to end," she said.

"Could you imagine if Rocky Balboa had gotten halfway up those art museum stairs and said, 'Well, I guess that's about far enough'? That's not the way it works," Clinton said, referring to a famous scene in the first "Rocky" movie. Watch Clinton compare herself to Rocky »

"Let me tell you something. When it comes to finishing the fight, Rocky and I have a lot in common. I never quit," she said.


UM, Hillary? Rocky got his ass kicked...