bad political move?

not that i'm on the fence about bush, but bringing up a marriage amendment again rubs me the wrong way for two reasons: the obvious homophobic nature of the bill, and using amendments willy-nilly. but won't this hurt him with people that are on the fence? i know many republicans that are not excited about the prospects of changing the constitution, so why mention it now? i am not seeing any political upside to this move.