More on Barack ObamaFor most of the election, Sen. John McCain's campaign has been somewhat subtle about trying to tie Sen. Barack Obama to the former '60s radical William Ayers.

No longer. A 90-second Web ad released Oct. 8, 2008, features sinister music, side-by-side photographs of Obama and Ayers, and a series of dubious allegations about their past connections, including this one:

"Ayers and Obama ran a radical education foundation together."

Ayers was a founding member of the militant Vietnam-era anti-war group the Weathermen. He was investigated for his role in a series of domestic bombings, but the charges were dropped in 1974 due to prosecutorial misconduct. He is now an education professor at the University of Illinois at Chicago, and actively engaged in the city's civic life.