Rachel Maddow spent a lot of time Thursday night on what is potentially the most damaging Herman Cain scandal: charges that his campaign manager, Smokin' Mark Block, used corporate money donated to Prosperity USA to pay Cain campaign expenses. Prosperity USA is affiliated with Americans for Prosperity, the conservative corporate advocacy group funded by Charles and David Koch.

Cain, of course, strenuously denies the allegations of sexual harassment against him, but when it comes to charges that he's too close to the rapacious Kochs, he pleads guilty. “I am the Koch brothers' brother from another mother,” Cain told an Americans for Prosperity summit Friday, insisting he was “very proud” to know the right-wing Kochs, who run oil and gas behemoth Koch Industries.

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But now Citizens for Responsibility and Ethics is asking for a probe of the ties between Americans for Prosperity and the Cain campaign. The Milwaukee Journal-Sentinel reported this week that Block used Prosperity USA funds to pay for Cain's travel and other campaign expenses. Block headed Prosperity USA before he joined Cain, and before that he was with Americans for Prosperity. Back before that, of course, he ran a Wisconsin judicial campaign that went so afoul of campaign law Block found himself barred from politics in Wisconsin for three years.

Maddow raised questions Thursday night about whether Americans for Prosperity might be functioning as a shadow Cain campaign, which would account for the former Godfather CEO's failure to assemble anything that looks like an actual presidential organization. Rather than running from that kind of speculation, Cain seems happy to encourage it. Slate's Dave Weigel reports that he entered the AFP event Friday to a thundering standing ovation, and immediately mentioned a New York Times story about the shadowy and possibly illegal connections between his campaign and AFP.

Weigel writes:

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"The article tries to make a case of how close the Koch brothers and I are," said Cain. The audience started chuckling. "I'm proud to know the Koch brothers," said Cain. "I'm very proud to know the Koch brothers. They make it sound like we've had time to go fishing together, hunting together, skiing together, golfing together. But just so I can clarify this for the media?" Chuckling louder now. "This may be a breaking news announcement for the media." Here it comes. "I am the Koch brothers' brother from another mother!" The room burst into applause. Koch stood up, and the titantron cameras found him, guffawing along with the front rows. "I'm their brother from another mother," repeated Cain. "And proud of it! You see, the reason that I'm running for president, folks, is that I want to unite the United States of America, not divide the United States of America."

How the country is more united by knowing Cain is the third Koch brother isn't quite clear. The black candidate's happy use of the joke "brother from another mother" is just another weird racial wrinkle in the Cain saga, in which the horrifying Ann Coulter boasts "our blacks are better than their blacks," presumably talking about liberal African-Americans, and Cain just smiles at the condescending support from right-wing whites. There was something deeply creepy about his appearance before AFP today, which felt more like entertainment than electoral politics. I flinched when the writer Touré called Cain's behavior "minstrelsy" this week, but I flinched even more watching Cain flatter and entertain the Kochs and AFP today. Touré has more to back up his argument after this performance.

The lawyer for one of the women who accused Cain of sexual harassment is set to make another statement Friday afternoon, and trust the media to pay more attention to the sex scandal than the campaign finance charges. Cain's ties to the Kochs, however, are proven and verified by the candidate. I don't expect GOP primary voters to care much about that, but the media should.