I voted for Obama. I think he is the far stronger of the two candidates left in the Democratic party. I haven't worked for his campaign. Frankly, I'm not as happy with some of his policies as I was with some of the candidates who have withdrawn. Still, he was my choice because of some intangibles that I couldn't quite make clear.
The following video expresses those thoughts clearly. It is just under 22 minutes long but it is worth listening to the entire thing. Let Lawrence Lessig tell you why he is for Obama and if your state is still to come in the primaries, Vote Obama for the next president of the United States.
Had I seen this video a week or so ago, I think I would have been out actively campaigning for Obama.