Here's video of the ad we reported on below that the Obama campaign is running in Ohio responding to the earlier Swift-Boating spot tying Obama to former Weatherman Bill Ayers..."With all our problems, why is John McCain talking about the sixties, trying to link Barack Obama to radical Bill Ayers?" the spot says, suggesting that McCain himself is behind the Ayers spot. "McCain knows Obama denounced Ayers' crimes, committed when Obama was just eight years old."As we noted below, the Swift-Boating group airing the initial Ayers spot, the American Issues Project, has made good on its vow to spend nearly $3 million to run the spot. And it's running in Ohio, Pennslyvania, Wisconsin, and Virginia. It's unclear as of yet whether the ad is running in the other three states where the Ayers spot is up.The Ayers spot and the size of the expenditure make it tougher to dismiss the Obama camp's warnings about the coming Swift-Boat campaign as mere wolf-crying. And Obama's response ad is another sign of the Obama camp's determination to signal that he won't be Swift-Boated -- both because the Obama camp wants to avoid John Kerry's fate, and because Obama advisers want to signal to jittery Democrats that they're poised to respond aggressively.