The Associated Press' Jim Kuhnhenn writes about a new ad from the American Issues Project aimed at Sen. Barack Obama.

The ad focuses on Obama's relationship with William Ayers, a founder of the Weather Underground.

But don't expect to see the ad on your cabler anytime soon — Kuhnhenn writes the ad was rejected by Fox News, and The New York Times' Jim Rutenberg reports that CNN rejected the ad as well.

"Fox News Channel said Thursday night that it would not accept the advertisement amid questions about its legality," writes Rutenberg. "That raised the possibility that other stations and networks could have similar issues, but Mr. Pinkston said he was confident the advertisement would have healthy exposure in the two states. CNN also said it turned the group down, citing a ban on negative advertisements from outside groups during the party conventions."