Remember that Romney is the man that would not stop using the Guatemalan illegal aliens, even when the national story broke, the media went back a year later, and Romney had rehired the same company and it’s Guatemalan illegals, again.
Remember Bush's half-hearted attempt to introduce some tiny steps toward making social security solvent? The AARP sent some of their plants to disrupt the initial hearings and he packed up the tents and retreated to the tall grass, never to bring up the topic again.
Compare and contrast that to the congressional smack-down he got on amnesty and recall the first words out of Karl Rove after the 2006 mid-term shellacking a wonderful opportunity to reintroduce comprehensive immigration reform. Which, if you recall, they promptly did.