You can check out the early exit poll.
What sticks out to me is that 10% of voters were people that changed their registration to vote. I think this is a good Obama demographic.
Although, it scares me a little that 1 in 5 people said race was most important factor and that 1 in 5 people said gender was the most important factor. I don't know if this will be good for Obama, or bad for him.
Here is the full text:
PARTY-SWITCHERS
One in 10 voters changed their party registration since the start of the year so they could vote in the hotly contested primary, which was open only to registered Democrats. About half of the party-switchers had been registered Republicans and the rest had been unaffiliated with either party. Another roughly 3 percent were voting for the first time in Pennsylvania.
VOTERS' DEMOGRAPHICS ...
As expected, the Pennsylvania Democratic electorate was overwhelmingly white, while a little more than half of voters were women. About three in 10 were age 65 or over. A quarter had household family income of more than $100,000 last year and about as many reported having a postgraduate degree.
Three in 10 Pennsylvania Democratic voters were union members or had one in their household. And four in 10 had a gun owner in their household.
... AND THE CANDIDATES' DEMOGRAPHICS
About one in five voters said the race of the candidates was among the top factors in their vote. About as many said that about the candidates' gender.
MAKING UP THEIR MINDS
One in five voters said they decided for whom to vote within the final week of the six-week Pennsylvania campaign. About one in 10 said they made up their mind Tuesday.
ECONOMIC GLOOM
As in earlier primaries, at least half of voters said the economy was the most important issue facing the country. About half as many said Iraq was the top issue. Health care trailed in importance.
Pennsylvania Democrats had a sour view of the economy — four in 10 said the country is in a serious recession and at least as many called it a moderate recession. Only about one in 10 said the economy is not in recession.
Update
Marc Ambinder has CBS's early exit polls.
They state
The exit polls show a smaller percentage of late deciders -- 23% -- than in previous states. The economy mattered most to 54% of voters. (TV news reports say that Clinton won these folks.)
The change versus experience question has been settled: 49% said change was their top vote-generating quality, versus 26 percent who said experience was.
About 15% of the electorate was made up of new voters. 37% are gun owners.
Still petulant: more than 60% of Clinton voters say they wouldn't be happy if Obama were the nominee; about half of Obama voters say the same. 25% of Clinton supporters say they'd vote for McCain in the general election; 17% of Obama supporters say they'd vote for McCain in the general election.
Still, 57% of Pennsylvanians believed that Sen. Clinton "attacked" unfairly compared to 49% who thought Obama did.
Update 2
Drudge Report claims an exit poll showing 52 Clinton, 48 Obama, but there is no proof.