Take that liberal propaganda and stick it up your butt. Bush's grandfather is far from the only one who had some sort of dealings with the Nazi's around that time. Many prominent Americans even openly supported the Nazi regime and it's ideology. Christ, as if 35 years wasn't far enough back, now you have to go over 60?!
As far as the present day Hitler comparison, open a book and learn true history instead of just sticking to the latest talking points and scare tactics. If Bush was Hitler, Michael Moore wouldn't be making movies, he'd be in an unmarked grave somewhere. Ted Kennedy would be rotting away in a prison camp, if not dead. We wouldn't have more than one political party, Congress wouldn't exist, Canada and Mexico would have disappeared long ago (you see, Hitler went after those pesky adjacent nations first), and any of these protesters you see at various rallies and such would be lined up and shot. Oh, and I don't recall the Gestapo ever investigating itself into a state of near paralysis over anything that occurred to prisoners in their custody (a la Abu Ghraib). I could go on, but I doubt it will sink into your dense brain.