From CQ Politics (emphasis added):
Former House Majority Leader Dick Armey (R-Texas) on Sunday said lawmakers who have not signed onto Rep. Paul Ryan's plan to balance the budget lacked "courage" and could be targeted by the conservative tea party movement as a result.
"All Paul Ryan is saying is let Social Security be voluntary, let Medicare be voluntary," Armey said. "The fact that he only has 13 co-sponsors is a big reason why our folks are agitated against the Republicans as well as the Democrats -- the difference between being a co-sponsor of Ryan or not is a thing called courage."