We've already seen Hillary gain supporters on FR.
Not enough to be a concern. The big danger is in the middle, with voters who pay attention every four years.
The President could avoid Hillary's trap and a big fight within the GOP simply by incorporating aspects of Tom Tancredo's guest worker proposal into an overall immigration reform package. Reports that the White House is looking to McCain and possibly Ted Kennedy to nurture support for legalizing illegal aliens in the Senate are worrisome. It's all upside for Hillary to triangulate against Kennedy and Bush in such a scenario.