This is complete B.S. Bush has been making the rounds on all the shows (O'Reilly, Hannity, Matt Lauer, Today Show).... I have seen all of these interviews. There's no way in HELL that Bush voted for Obama or would have endorsed him. He even says in one of the interviews that he was upset that McCain didn't ask him to campaign for him.
There's also another, "behind the scenes" kind of statement from a former Bush aide who said Bush was watching Obama during the campaign for 2008 and said something along the lines of, "this guy doesn't even have a clue." THAT sounds like something Bush would say, not what hef daddy posted.