I think this is one state where Democrats and Obama are going to have a near impossible time replicating, unless their name is Evan Bayh. Obama is probably the first Democrat ever to carry the state without carrying the two Southern Congressional districts(IN-08 and IN-09). His margin came completely from unsustainably high turnout in Marion county and Lake county. This is probably a once in lifetime thing for Democrats.
Indiana was the one state where the Obama campaign's spending and organization overwhelmed the Republican tilt of the state. Had McCain made even a slight effort here he probably would have won. Of course, that would have meant siphoning resources away from must-win states.