Career politicians vote for other career politicians. That's how they keep their interests protected. Sometimes it may be to protect their party's interests ... and other times (like now?) it may be just to protect the whole political system as it's been organized to profit both major parties. I used to think of republicans like McCain and Romney as slightly right-leaning democrats. Republicans when the cameras were on them, and supportive of democrats and their agendas when behind closed doors. The very essence of politics.