After a six week lull in the presidential primaries, Democratic candidates Hillary Clinton and Barack Obama delivered their closing arguments to Pennsylvania voters today.

Both were trying to lower expectations heading into tomorrow's pivotal primary.

The Clinton camp said, despite their lead in the Pennsylvania polls, they will be content with any win, large or small.

Obama predicted it will be a close race and that he will do better than expected.

Pennsylvania is Clinton-friendly – whiter, older, and more female than the national average with nearly a million union households – all demographics that have favored her in other states.

A loss in this state would be catastrophic.

“Do everything you can to convince people to go vote who say they're not going to vote, take them to the polls, call your friends and neighbors,” said Senator Hillary Clinton.

Barack Obama has outspent Clinton by more than two to one in Pennsylvania which helped close what was once a considerable Clinton lead.

Still he told a Pennsylvania radio station, he's not going to win.

“Are you predicting a win here tomorrow?” asked the radio host.

“Well, no, I'm not predicting a win. I'm predicting it's going to be close. And, that we are going to do a lot better than people expect,” said Senator Barack Obama.

The Clinton campaign is having none of it, arguing that Obama has spent so much money in Pennsylvania, a loss would bring his electability into question.

On the campaign trail, for a last round of rallies and restaurants, both candidates were relatively mellow compared to a rough and tumble weekend with each accusing the other of misleading ads.

Their campaigns did get into it over Clinton's final ad, which included the image of Osama Bin Laden.

You need to be ready for anything - especially now, with two wars, oil prices skyrocketing and an economy in crisis. Harry Truman said it best - if you can't stand the heat, get out of the kitchen. Who do you think has what it takes?

Taking exception, an Obama spokesman said, "we already have a president who plays the politics of fear, and we don't need another.”

Pennsylvania is the largest of the 10 contests remaining.

The state has about four million registered Democrats.

Analysts say Clinton has to win 60 percent of the delegates in the remaining primaries to draw even with Obama in the delegate count.