That is true...
From HumanEvents.com, April 29, 2008:
"By all accounts, he [Obama friend and associate, Bill Ayers] was a ferocious, violent, revolutionary Marxist in his halcyon days as a Weatherman leader. He and his Weatherman bombers were enamored of Ho Chi Minh, Che Guevara, Fidel Castro, Mao Tse-tung -- indeed, all the murderous heroes on the Left. Referring to the Weatherman members in August 1969, he said (according to the FBI): 'We’re revolutionary Communists.'
He got off on the group’s multiple explosions, too, and discusses them rather lovingly in his memoir.
Ideal Bombing Weather:
'Everything was absolutely ideal on the day I bombed the Pentagon,' he writes (although he concedes it was really a group effort). 'The sky was blue. The birds were singing. And the bastards were finally going to get what was coming to them.' (p. 256 in the 2003 edition.)
Article: Obama and His Weatherman Friends
http://www.humanevents.com/article.php?id=26243
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'Guilty as hell, free as a bird—America is a great country,' he [Ayers] said."
August 2001, Chicago Magazine (article: No Regrets)
http://www.chicagomag.com/Chicago-Magazine/August-2001/No-Regrets/
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"This is a guy who lives in my neighborhood, who's a professor of English..."