Why do so many people support the republican party?

I mean lately all they have done is to give tax breaks to the wealthy and have been spending recklessly. I cant understand how anybody in the middle cl can support mccain or bush for that matter when they have done nothing but reduce our significance and cripple us with taxes. In contrast Obama says that he is in favor of repealing tax breaks for the rich that bush enacted and taxing them more. That just seems logical to me what am i missing...