This is the one reason Conservatives like myself refusing to vote for Romney could use to hold our noses and vote him in. Soetoro-Obama's made it clear with his refusal to enforce Federal laws on the books to protect his precious millions of illegals and his illegal Executive Amnesty that he will expand that effort to a General Amnesty if reelected.
However, the one caveat to supporting Romney--particularly if he picks the pro-Amnesty and ineligible Rubio or Jindal--is that a Republican president has a better chance of getting a General Amnesty on his desk (courtesy of the RINOs controlling the House) than another 4 years of Soetoro-Obama. Soetoro-Obama had 2 years of all-Democrat rule and couldn't get Amnesty thru. Amnesty can't pass with the Republicans controlling the House.
Romney simply can't be trusted on Amnesty. He's vacillated between pushing self-deportation and E-verify (though he won't state whether he wants mandatory E-verify and if so, which version--HR 2285 or legislation without the preemption clause--and his touchback green card Amnesty scheme with "little Ellis Islands" along the war zone known as the U.S.-Mexico Border.
His VP choice will tell Conservatives which way Romney is going.