Looks like his mistakes are going to define him before he gets to define himself.
Here is a result of a poll regarding Obama's small town twits comment:
'Partisan and ideological differences suggest that the comments are more likely to be a factor in the General Election than in the Primaries. A plurality of politically liberal voters—46%--agree with Obama’s statement while 33% disagree. Moderate voters take the opposite view and disagree by a 51% to 27% margin. Seventy-four percent (74%) of conservatives disagree with Obama’s statement, only 12% agree. '
This country is still a bit 'conservative' and defining a politician as liberal and elitist will blunt their appeal.
Since Clinton's support draws from the Regan Democrats you should see them hammer Obama this week and the days leading up to the PA and Indiana primaries. The Rebublicans are going to doing a lot of 'testing' to see what message hits home with this segment.
I opine that all John McCain needs is a sliver of these Regan democrats to eek out a win over Obama.