LIVE BLOGGING

(6:21): EXIT POLL: Clinton 52 Obama 48
(6:22): MSNBC Exit Poll: Clinton 48 Obama 43
(7:12): From Drudge Report:
Women
Clinton 55%
Obama 44

Men
Clinton 47%
Obama 53

Whites
Clinton 60%
Obama 40

Blacks
Clinton 8%
Obama 92

(7:15): From ABC News
"Despite all the down-to-the-wire campaigning, preliminary exit poll results indicate that nearly eight in 10 Pennsylvania voters made up their minds at least a week ago, and six in 10 decided on their candidate more than a month ago -- a higher number of early deciders than the norm in Democratic primaries to date."

(7:51): From the Morning Call:

"Women and older voters came out in force Tuesday in Pennsylvania's presidential primary, encouraging signs for Hillary Rodham Clinton as she sought a win to sustain her campaign.

Both groups have tended to support Clinton in previous states, and she needed their support once again. Pennsylvania was a must-win state for Clinton as she tries to overcome rival Barack Obama's lead in the race.

Should she lose, it would be a fatal blow to her candidacy -- a defeat so unexpected that it would sap her arguments to remain in the race. It would be the dawn of a Democratic era minus the Clintons as the dominant force."

(9:20): HILLARY WINS PENNSYLVANIA
12% Reporting: Clinton 53 Obama 47

(9:32): The Politico provides a state map that reports primary results from each county.

(9:34): Surprise: Obama takes early lead in Allegheny County with 57% against Clinton's 43%.

(10:03): Clinton is now leading in Allegheny 56% to Obama's 44%.

(10:05): Chester and Montgomery Counties still not reporting. Delaware County: Clinton - 52% Obama - 48%; Philadelphia County: Clinton - 39% Obama - 61%; Bucks County: Clinton - 66% Obama - 33%