Contrast that with 1964, the last time the Dem won the state, and you can see a pretty clear preference for LBJ, who won 56-44%. Note Goldwater carried Porter County (directly east of Lake County) in '64 and McCain lost it in '08, the only one Goldie beat him out in.
I’ll grant Barr probably cost McCain Indiana, but I also think he took the state for granted. I’m looking at populous Allen County in the northeast, home of Fort Wayne, it went for Bush 63%-36%, but only went for McCain 52%-47%. The state really shouldn’t have been close enough for any third party candidate to cost McCain the win (or for that matter, vote fraud).