Obama seeks to silence ad tying him to 60s radical

DENVER (AP) - Barack Obama is striking back fiercely and swiftly to stamp out an ad that links him to a 1960s radical, eager to demonstrate a far more aggressive response to attacks than John Kerry did when faced with the 2004 "Swift Boat" campaign.

Obama not only aired a response ad to the spot linking him to William Ayers, but he sought to block stations the commercial by warning station managers and asking the Justice Department to intervene. The campaign also planned to compel advertisers to pressure stations that continue to air the anti-Obama commercial.

It's the type of going-for-the-jugular approach to politics many Democrats complain that Kerry lacked and that Republicans exploit.