While I don't agree completely with your portrayals of the Democrats' preferred demographic voter blocs, pdq, I do think you may be right in your assessment with the union voters.

It doesn't matter to them who their union leadership endorses, and Ronald Reagan proved that, in spades.

If you look at the wildcat shutdown of the west coast ports on May Day, and even more importantly, the beginnings of a nascent coalition with immigration rights groups who are the only potential new union recruits in this country in a very long time, and the Obama camp just cannot afford to get this wrong.

The Latino voting bloc isn't in his corner, and if he keeps dissing the working class and low income voters of color outside the African American community, and you have a real problem come November.

Because if the unions can't get the rank and file out to work the streets for Obama in the fall, then Obama is doomed as a candidate.

I mean, he is going to need more than just the solidly middle class public sector unions to win.