The same guy who served as Ronald Reagan's loyal deputy during the triumph of Reaganomics and the defeat of communism actually cast a vote to make Hillary Clinton president, huh? Is this a real change of heart? Was he never anything more than an opportunist? Or is Donald Trump just that objectionable?
Keep in mind that Papa Bush didn't write the book. He was interviewed for it by author Mark Undergrove, whose premise seems to be that the Bushes represent the last of a dying breed of Republicans and that Trump represents the first of whatever he is. If true, you can see why the Bushes might feel salty about it, and apparently both of them do - although W. is more cirumspect and allowed that he simply left his presidential ballot blank rather than voting for the most horrible woman on the face of the Earth. I guess that's something.