Probably cost him Florida to boot.
Do you assume this because of all the old people in FL who might be worried about their Medicare and Social Security? You might be surprised that Marco Rubio has taken a stand similar to Paul Ryan regarding both those programs, and has received tremendous support from the old folks in the state. Rubio apparently took the time to explain the ideas, and they made sense to the old folks, especially when it became clear to them that THEIR situations were not going to change.
If Paul Ryan makes this position clear to older voters in the rest of the country, I believe many will see the wisdom in NOT voting for Obama or any of the other Democrats, this time around.