He's not alone - the conservative Club for Growth and Republican Study Committee have lauded Ryan's roadmap, while stopping short of saying it should be the official Republican budget.
"You can't even talk seriously about the debt, deficit, or a balanced budget without fundamentally reforming entitlement programs," Club for Growth spokesman Mike Connolly told me this week after Rep. Jeb Hensarling said he supported the Ryan plan.
"Every candidate will have to decide for himself what issues to campaign on this year, but if Republicans want to show the American people they can be trusted with leadership again, attacking the Democrats isn't enough," Connolly added. "The times cry out for a bold agenda of conservative economic reform, and for politicians like Jeb Hensarling who can articulate one."
Democrats have seized on the Ryan roadmap to paint Republicans as returning to Social Security privatization plans, even though leaders insist this won't be in their 2010 playbook.
Holtz-Eakin told me that the politicking and fear of retribution at the polls is what's made entitlement reform so tough.
"Both sides have to find a way to move past demagoguing. Partisan legislation is never very good," he said.
Conservative commentators also are defending Ryan.