Obama's Ayers ad

Here's the audio of Obama's new radio spot responding to attacks on his relationship to Bill Ayers. It's a version of his television spot accusing McCain of using "smears" to avoid talking about the economy, but — unlike the TV spot — mentions Ayers by name and discusses him at some length:

"Bill Ayers is a professor of education who once served with Obama on a school reform board, a board funded by conservative Republicans tied to McCain," says the ad's narrator. "When Ayers committed crimes in the '60s, Obama was 8 years old. Obama condemned those despicable acts. Ayers has had no role in Obama's campaign, and will have no role in his administration."

"And John McCain? With no plan to fix our economy, smears are all he has left," says the narrator.

The ad is airing in Wisconsin, Colorado, and likely other states.