This ABC News piece speculates that Romney's immigration position might be straining his relationship with Jeb Bush:
Jeb Bush did not respond to a request for comment. But Ana Navarro, a Florida Republican activist and fundraiser who has worked with Jeb Bush on immigration issues in the past, said the former governor told her last weekend that he is "disappointed" that Romney has denounced the immigration bill in television advertisements.
"It's one of the biggest policy and legacy issues of his brother's administration, but more than that, Jeb believes in this," said Navarro, who is supporting Sen. John McCain, R-Ariz., for president. "I don't speak for Jeb, but I know where his heart is on this issue."
Yesterday, Peter Wallsten quoted Jeb Bush as saying, "the tone of the debate had been 'hurtful' to him and his Mexican-born wife, Columba."