Barack Obama seemed puzzled. Angrily puzzled. The apostle of hope seemed flummoxed by the audacity of the question. At the April 16 Philadelphia debate, George Stephanopoulos, longtime aide to Democratic politicians, was asking about his longtime association with Weather Underground bomber William Ayers.

The Weather Underground attacked the Pentagon, the Capitol and other public buildings; Ayers was quoted in The New York Times on Sept. 11, 2001, as saying, “I don’t regret setting bombs; I feel we didn’t do enough.”

It was at Ayers’ house that Obama’s state Senate candidacy was launched in 1995; Obama continued to serve on a nonprofit board with Ayers after the Times article appeared.  ~realclearpolitics.com

As Michelle Malkin points out this connection is more than just a happenstance. Ayers is a close political connection in Chicago.