Dennis Kucinich actually introduced at least one of the resolutions to impeach Bush somewhere along the line, so trust me, Obama is not the only president he'd want to see impeached for starting an unconstitutional war. He is a Democrat, but he's also one of the most left-leaning Democrat representatives we've got (which isn't saying much for America, but still) save for Barney Frank, who's got no trouble calling himself a socialist even with people in this country recoiling from the word "socialism" like it's riddled with plague.

That said, I wouldn't be surprised if he's looking for another crack at President next year, since it seems like he's been trying every Presidential election for the past decade.

EDIT: Also, I *almost* want to see Obama get impeached for taking us to war -- not because I genuinely WANT it, but because I seriously think the entire left-leaning American population would shit a collective brick in response and the Republicans would be absolutely fucked. And Kucinich would be a laughingstock in his own party.