It's been a fight, but Fox News will at last air Media Matters' ad discussing the $1 million donation made by Fox News' parent, News Corp., to the Republican Governors Association. The ad is scheduled to appear tonight during The O'Reilly Factor, which begins at 8 p.m. ET.

Politico has detailed what Media Matters went through to gain approval for the ad; it took three tries before Fox News would accept it. The result, as The Washington Post's Greg Sargent points out, is that “Fox primetime viewers will finally learn that fair and balanced Fox News's parent company gave $1 million 'to oppose Democratic candidates for office this November.' ”

We rarely tell people to watch Fox News, so check it out tonight as we bring the facts directly to a news organization that has been reluctant to report them.

UPDATE: Here's the ad: