Greetings from the City of Brotherly Love, located in the key Keystone state. A win for Sen. Barack Obama, D-Illinois, here tomorrow could end this race. But Sen. Hillary Clinton, D-NY, has consistently led in the polls here.

A big question being debated -- how big does her win need to be?

Her chief cheerleader in the state, Gov. Ed Rendell, told voters in York Sunday that the "W" needs to be sizable.

"Not to put any pressure on you folks, but this is it, this is it," Rendell said in his inimitable style. "We're gonna we win, no doubt about it, but we gotta win big. If we win big, we're going to wind up with more votes than Barack Obama. It's gonna be a very big decision for the superdelegates."

The latest Quinnipiac poll has the race fairly static, Clinton leads Obama 51% to 44%.

Other key findings -- women are backing Clinton 57-38....men are backing Obama 53-42... White Catholics are for Clinton 66-29....Voters over 45 back Clinton 54-40...Under 45 go for Obama 57-41.

"Pennsylvania voters apparently made up their minds a couple of weeks ago and nothing has happened since to change them," said Clay F. Richards, assistant director of the Quinnipiac University Polling Institute. "An extraordinary turnout effort by Sen. Barack Obama's campaign could snatch this victory from Sen. Hillary Clinton, but that does not appear likely. Sen. Obama got off message after his 'bitter' remarks and never regained his momentum, giving Sen. Clinton the opening to fight another day in Indiana and North Carolina."

By Jake Tapper, ABC News, April 21, 2008