First came Sen. John McCain's (R-Ariz.) "wacko birds" comment about Sens. Ted Cruz (R-Tex.) and Rand Paul (R-Ky.).

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Now, Sen. Claire McCaskill (D-Mo.) is joining in the criticism of the GOP's new right flank, comparing senators like Cruz to the man she beat in 2012, Rep. Todd Akin (R-Mo.).

"It's the reason I could win, was because frankly they nominated a flawed candidate that was so extreme," she said in an interview Tuesday morning on MSNBC's "Morning Joe." "But it wasn't what Todd Akin said that was the problem; it's what he believed. And that is the base of the Republican Party right now."

McCaskill said senators like Cruz would like to drive the country "off the right edge of the world."

(The operable comments start at about the 6:30 mark in the video above.)

"On the other side, it’s a mess,” McCaskill said. “I mean, they are — they really have a civil war in their party right now.

"You’ve got people who are willing to compromise and who understand the beauty of compromise in our democracy, and then you have people like Ted Cruz and some of the others that just think that they want to drive as hard as they can off the right edge of the world."