Jeb Bush states that undocumented immigrants come here as an "act of love", predictably gets hammered by numerous right wingers. If he runs this will get thrown in his face repeatedly. I think Speaker Boehner should have bit the bullet and passed the Senate bill, taking immigration off the table for the most part for the 2016 elections.
In 2008, McCain had to dump his own immigration plan to curry favor with his party.
In 2012, Romney said the "self deportation" method was the way to go for immigration, which got him roundly criticized.