John McCain has a new TV ad out attacking Barack Obama's association with former 1960s radical William Ayers. It may be his sharpest attack yet, and accuses Obama of bad judgment and blind ambition.
News outlets, including the Associated Press, have reported Obama and Ayers were not close but worked together on two nonprofit organizations.
The McCain ad says: "When convenient, he worked with terrorist Bill Ayers. When discovered, he lied."
McCain's campaign says the ad will run nationally.