“Mr. Richardson’s endorsement came right around the anniversary of the day when Judas sold out for 30 pieces of silver, so I think the timing is appropriate, if ironic,” Mr. Carville said, referring to Holy Week.

McPeak, a former chief of staff of the Air Force and currently a co-chair of Obama's presidential campaign, said that sounded like McCarthy.

"I grew up, I was going to college when Joe McCarthy was accusing good Americans of being traitors, so I've had enough of it," McPeak said.

"I think it would be a great thing if we had an election year where you had two people who loved this country and were devoted to the interest of this country," said Clinton, who was speaking to a group of veterans Friday in Charlotte, N.C. "And people could actually ask themselves who is right on these issues, instead of all this other stuff that always seems to intrude itself on our politics."