ACORN engaged in major voter registration fraud in Indiana and Wisconsin during the 2008 election.
Ordinarily, Indiana leans Republican, but in 2008 Obama’s narrow victory was within the margin of vote fraud.
Indiana's Lake County, bordering Chicago on the northwest corner of the state, is heavily democrat. Because of it's proximity to Chicago, it is also on Central Time, one hour later than the rest of the State, and so its polls close an hour later. I recall that in 2008, the Lake County democrat party chairman openly said "We'll get 0bama the votes he needs." Or words to that effect.
However, in all fairness, you could also attribute 0bama's win to Hamilton County, the most republican large county in the state. McCain won Hamilton County, but not nearly by the same margin that Mitch Daniels won the county in the down ballot governor's race. Had those Hamilton County votes for Mitch also gone to McCain, McCain would have won Indiana.