Because McCain — McCain — is too conservative, I guess. Pick the punchline: McCain ripping on the Club for Growth last year for attacking Chafee during his unsuccessful reelection bid? Or Chafee refusing to switch parties in 2001 even as Mac himself was allegedly reaching out to Democrats? Exit question: Who’s the maverickiest of them all?

Update: He’s endorsing a guy who actually campaigned against him. Although so has Joe Liebs, hasn’t he?