Barack Obama won decisively the contests held in Washington, Nebraska and Louisiana yesterday, gaining on Hillary Clinton and perhaps more importantly, gaining the appearence of momentum heading into the so-called “Potomac Primaries” of Virginia, Maryland and DC.

The make-up of registered Democrats in those three contests on Tuesday favor the unlikely coalition of African-American, far-left liberal and independent-minded moderates that Obama has cobbled together.

I think that Obama needs to win big on Tuesday, because his coalition is not nearly as strong as traditional, hardcore Democrats, who have been lining up behind Hillary, in the later bigger prizes of Texas, Ohio and Pennsylvania.

Looming large is March 4th, where Texas and Ohio will either put Hillary Clinton in the driver’s seat for the nomination, with Pennsylvania coming in late April for the potential coup de grace.