It currently appears that Lake County could possibly swing Indiana over to Obama. Many people here have suspected fraud, and I unfortunately was one of them (for 10-20 minutes only!) But I've done some math, and it looks like the exit polls have predicted Obama to get around 64% of the vote in Lake, which corresponds to the numbers coming out of there right now. Calculations below:
One of the questions in the Indiana exit poll analyzed the vote by region. Specifically, Obama won the "Gary/South Bend/NW" region 55-44. Lake County is the only one in that region that hasn't finished reporting, so we can try to extrapolate its numbers from that statistic.
Since there's also a "Northern Indiana" region, we can clump the counties east of St. Joseph (South Bend) into there. That leaves us with eight counties: Lake, Porter, LaPorte, Newton, Jasper, Stark, Pulaski, and St. Joseph. There are also counties to the south that might have been considered part of the region by CNN, but they are small (a few thousand votes at the most), and went for Clinton - so including them would predict a larger margin for Obama in Lake.
Adding up the vote totals from Porter, LaPorte, and St. Joseph, Obama has 65,559 votes and Clinton 73,941 votes. Currently, Lake County looks like it will have total turnout of ~130,000 votes, meaning a total region vote of 269,500. If Obama is to win 55% there, he needs 82,666 from Lake, or 64% there. That would give him a county-wide margin of 36,400 votes, or an additional margin of 14,741 votes (beyond the ones already tallied)- enough to put the election within the margin of error (especially with a few precincts left to report in Indianapolis.)
Obama is currently winning 65% of the vote there, so it looks like the exit polls are vindicating that no fraud has occurred.
UPDATE: From TPM, courtesy of Kevin at MyDD, Clinton is canceling her public events tomorrow. If this is true and she is dropping out, I would urge all my fellow Obama supporters to show some sympathy. I once supported John Edwards for president, and I understand how it feels for your candidate to drop out. Now is the time for unity, not for widening old wounds.