Maybe it isn't, but the Obama administration is still supporting it. At the end of the day, which would you rather do:
Cry out in agony when SOPA passes because you still want to believe a fairy tail that there's a politician who actually cares about non-donors?
Or would you rather say "Oh, my bad. Guess I was wring..." in the rare chance that Obama didn't actually support it. Also: he can still change his mind abut it and claim he was against it this entire time when coverage starts spreading, but if I were you, I won't buy it. Remember: there's no friends in politics. That especially counts towards the nobody.
From what I read, Obama is guilty. No matter how much he did and will deny it.