Warren Buffet and his politics?

Why would a person like Warren Buffet and for that matter multimillionair Hollywood types want to vote for a Democratic president? The Democrates are know for higher taxes on the weathy and for cutting tax breaks on capitol gains. So why would a wealthy person want this kind of president? The only conclusion I can come up with is that they have so much money that it doesnt matter to them to give back some more. Any thoughts?