From TPM, an overview of conservative economists' assessment of the Ryan plan. Their bottom line is not that different from Krugman's -- the plan is neither serious nor courageous. Here's a taste:

"It doesn't address in any serious or courageous way the issue of the near and medium-term deficit," David Stockman told me in a Thursday phone interview. "I think the biggest problem is revenues. It is simply unrealistic to say that raising revenue isn't part of the solution. It's a measure of how far off the deep end Republicans have gone with this religious catechism about taxes." Stockman, who directed Ronald Reagan's Office of Management and Budget, approves of Ryan's entitlement proposals, but breaks faith over taxes and the GOP's unwillingness to slash defense spending. And he laughs off the notion that the plan will do anything about unemployment, let alone dramatically reduce it, which Ryan and his plan claim it will. "This isn't 1980. It's not morning again in America. it's late afternoon, or possibly even sunset."On this score, Doug Holtz-Eakin -- a former McCain and George W. Bush economic adviser -- told Huffington Post Ryan's plan is "implausibly optimistic."