Since mid-July, the liberal media watchdog group Media Matters for America has been on a crusade against CNN's Lou Dobbs for calling on President Obama to release a copy of his birth certificate. (Dobbs says he believes Obama was born in Hawaii but that Obama should release his birth certificate in the name of promised transparency; Media Matters says Dobbs is raising questions about Obama's birth and ginning up suspicions.) Tomorrow, the group will start running an TV ad criticizing Dobbs, and the goal, as Greg Sargent has reported, is to run it during Dobbs's own show, which airs at 7pm Eastern. Media Matters has bought air time on CNN, Fox, and MSNBC for the next week in DC, New York, and Atlanta; the group says it is still waiting for a response from CNN on whether the network will air the ad during Dobbs's show. Here's video of the ad, released today by Media Matters:

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