Rubio is a smart guy. He knows that it won't pass the house.

Debating whether he is sincere or not is meaningless. Rubio is introducing this bill because he has something to gain from it. Apparently, it's republican's feeble attempt to get some Latino votes.

But if he was really smart, he would know that Romney would lose even with Latino votes. <-- which would be our loss because if Rubio knows this, he doesn't have any incentive to introduce his bill anymore.