It was always a mystery to me why Bush never said anything. I can only think he felt that there was controversy over his election, and he didn’t want to stir up more rancor or give the Dems and the media any more reason to hate him. But he didn’t realize that silence looks like weakness, and there’s nothing that emboldens the Dems (or any enemy) like perceived weakness.
It was too bad, because I think he actually would have gotten support had he fought back.