This doesn't surprise me at all. I've always admired and respected Bush 41. I wouldn't be surprised if Dubya and Jeb also wind up pulling the lever for Hillary, though I doubt if they'll openly say they're supporting her over Trump. Bill Clinton is best friends with Bush 41 and has shown him much kindness over the years; that fact isn't lost on a family as closely knit as the Bushes. Also not lost on them is the fact that Trump is the only candidate to have said disparaging things about the Bushes during the course of the campaign. Hillary, on the other hand, has openly praised Dubya several times for helping her to persuade a douchebag Republican house into providing aid to New York after 9/11.

http://www.politico.com/story/2016/09/exclusive-george-hw-bush-to-vote-for-hillary-228395