American people are fairly pragmatic. The vote results in today's election are not a vote for liberals - most of the Democrats who are winning tonight are not anybody's idea of wild-eyed liberal. Many of them are social conservatives.
Instead, the "vote the bums out" attitude is a rejection of what is widely perceived as wild-eyed ideologues who to this day cannot admit that their policy does not work. Some Americans are conservative and some are liberals. The swing voters are pragmatic. When you move into a state of denial, you can expect to lose their vote.