I don't mind people wanting to see a bill failing to pass if it's something they don't agree with. But what I find mind-boggling are politicians who obstruct a bill's passage even they actually agree with it, only because they don't want to give the President a victory.
It's not about the President, it's about America. Don't take a position based on how this will reflect on a President's track record. Do so because you whole-heartedly agree or disagree with the merits of the bill.