Obama isn't anymore "liberal" than Clinton. Clinton isn't any more "liberal" than Obama. If either of them were really all that "liberal", Nader wouldn't be running against them. The "too liberal" argument is a right wing talking point that is as much empty rhetoric as anything.

If you're already voting Republican and think that Obama is too liberal, fine. Makes sense. But if you're pro-Hillary it really doesn't mean anything. They are both left-of-center.