It's becoming increasingly clear that Fox News' employment of a "political analyst" who doubles as an adviser to a GOP super PAC is a major ethical problem.

During a regular Fox News appearance last month, Karl Rove -- who cofounded the GOP super PAC American Crossroads -- launched a series of attacks on Democratic senate candidate Bob Kerrey. Rove's attacks directly echoed ads his super PAC had been airing in Nebraska against Kerrey, but Rove did not disclose Crossroads' heavy investment in the race to Fox viewers.

Rove, the longtime George W. Bush advisor turned Fox News analyst and Wall Street Journal columnist, helped cofound the American Crossroads in 2010. After being active in the 2010 midterms, Crossroads has devoted itself to defeating Obama and helping Republicans in various congressional races in 2012. Rove clearly sees his role as a media figure as a means to help achieve Crossroads' goals.

Last month, Greta Van Susteren hosted Rove on her Fox News program to discuss the then-upcoming Wisconsin recall election. To her credit, at the start of the segment, Van Susteren asked Rove to disclose a potential conflict of interest, saying that Crossroads "makes contributions to different issues around the country. Just so that we're absolutely clear, you're here as a Fox analyst. But do you have any money in this race at all, in this recall race?" Rove assured Van Susteren that while he had personally donated to Wisconsin Governor Scott Walker, Crossroads was not involved in the race.

A few minutes later, the conversation shifted to the GOP primary in the Nebraska senate race. Van Susteren did not pause again to ask Rove if Crossroads had money invested in the race (which it does), and Rove certainly didn't volunteer the information, even though he had been asked earlier in the segment about a possible Crossroads conflict of interest. Rove then used the opportunity to trash Bob Kerrey, the Democratic candidate in that race, while lauding Deb Fischer, the winner of the GOP primary.