Paul Ryan pledged to repel Democratic attacks on his proposal to privatize Medicare in his speech. 

Our opponents can consider themselves on notice," he said. "In this election, on this issue, the usual posturing on the Left isn’t going to work.  Mitt Romney and I know the difference between protecting a program, and raiding it.  Ladies and gentlemen, our nation needs this debate.  We want this debate.  We will win this debate."