House Republican campaign chief Greg Walden on Wednesday launched an attack on the entitlement changes contained in President Obama's budget proposal -- a signal that the entitlement reform well might already be poisoned.

Appearing on CNN, the National Republican Congressional Committee chairman accused Obama of "trying to balance this budget on the backs of seniors" and signaled Republicans may try to use the changes against Democrats in the coming election.

Walden's comments come even as key Republicans have embraced Obama's "chained CPI" proposal to cut Social Security benefits.

"I thought it's very intriguing in that his budget really lays out kind of a shocking attack on seniors, if you will," Walden (Ore.) said. "We haven't seen all the detail yet, so we'll look at it. But I'll tell you, when you're going after seniors the way he's already done on Obamacare, taking $700 billion out of Medicare to put into Obamacare, and now coming back at seniors again -- I think you're crossing that line very quickly here in terms of denying access to seniors for health care..."