[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/05/18/art.specter.rachel.jpg caption="Sen. Arlen Specter speaks to reporters in Philadelphia."](CNN) - About two hours before polls close in Pennsylvania, a subdued Sen. Arlen Specter walked into the Sheraton Hotel in Philadelphia and told reporters he is optimistic about the outcome of tonight's Democratic primary race.
"I'm optimistic if we get out our vote. I've been in a lot of tough races, a lot of close races," Specter said. "I would describe six of my races as the political fight of my life. I am like a cat with seven lives."
After a hard fought campaign, Specter can only wait for results to be announced.
"No regrets. No regrets. No regrets," the incumbent senator said.
Specter has waged a bitter campaign against Rep. Joe Sestak. The winner of Tuesday's primary will advance to the general election.