The idea that he couldn't be tarred with being a second W, from the right or the left has been debunked now.
I have fought posters tooth and nail to explain that it is Karl Rove and his tactics against Perry and his team (including Carney) who have been at odds.
This continued with Rove and the "Bush team" working with Sen. Kay Bailey Hutchison to defeat Perry in the 2010 election so she would return to Texas and the Governor's seat. AND it appears that this faction (from what is discernible in the media) is backing Romney. I did not put this on a Bush vs Perry footing.
I've also had to dispel this Bush II stuff -- The Bushes are from money and elite schools; Perry is hardscrabble, an Aggie and has worked his butt off to achieve his goals.