Obama and the Constitution?

Quote:

Obama issued a statement supporting the tax on the AIG bonuses, saying it would send "a strong signal to the executives who run these firms that such compensation will not be tolerated."

Quote:

If enacted, the tax could easily come under legal challenge. "This violates some fairly old-fashioned provisions of the Constitution called bills of attainder and ex post facto laws and things like that," said Terry Connelly, business school dean at Golden Gate University.

Gee, there's that pesky Constitution again. Hey, isn't Obama supposed to be an expert on that document? Shouldn't he know this too? Why's he keep trying to get things done that require we ignore it, hmmm?