No, sure-loser GOPe nominees McCain and Romney are why we have Obama. Had nothing whatsoever to do with Bush.
With due respect, Bush was presiding over the biggest recession since the Depression when voters went to the polls in 2008. Stock market was diving and there was fear of bank runs. He was so unpopular the GOP didn’t want him at the 2008 GOP convention. And no GOP candidate wanted Bush campaigning with him. There was a woman carrying a sign outside the GOP convention that said “McCain = Bush” . The delegates booed her, assuming - rightly - that she was a Democrat. But would they have booed if the sign said “McCain = Reagan”? No, because Reagan was popular, but the public hated Bush and the GOP was afraid to be associated with him.
And Bush was also presiding over TARP I — another unpopular loser of a policy that paved the way for Obama’s TARP II.