Bill Clinton barnstorms Pa. for Obama, Democrats

"He is going to hit this ground running the day after the election. He's not going to wait until he's sworn in and he is going to start to implement as soon as he can, a plan that is going to put us back on path," Toomey said. "We've got the right man for this moment in Mitt Romney, and he's going to start with real change on Day 1."

Elsewhere, former New York City Mayor Rudy Giuliani led a team of ex-Republican officeholders and actor Jon Voight to stump for Romney in Pennsylvania. In Conshohocken, about 150 supporters listened enthusiastically, with life-sized cutouts of Romney and running mate Paul Ryan serving as a backdrop as Giuliani criticized Obama for what he called a lack of leadership.

Polls are open Tuesday, from 7 a.m. until 8 p.m., as the political parties and other groups crank up huge get-out-the-vote efforts and deploy poll watchers and lawyers to address voting complaints or to watch for dirty tricks or perceived irregularities. Philadelphia District Attorney Seth Williams said his office will have mobile units available to be dispatched to any polling place if there are reports of voter intimidation, fraud or harassment.

The last-minute blitz of presidential campaign ads — mostly attacking Obama — has added to voters' weariness. But Ian Smart wasn't complaining as he waited near the back of the line that snaked around the block to the Palestra.

"This has been a long and frustrating few months, but the momentum is with us," the Drexel University business major said. "I feel very confident about the outcome tomorrow. I'm fired up."

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Levy reported from Camp Hill, Pa. Associated Press writers Kevin Begos in Pittsburgh, Patrick Walters in Philadelphia and Matt Slocum in Conshohocken contributed to this report.