Mike Gravel was on Democracy Now on June 17th.
Former Senator Mike Gravel Calls for Independent 9/11 Investigation and Prosecution of President Bush and Vice President Cheney
The former Democratic senator from Alaska discusses his presidential campaign, his role in the releasing of the Pentagon Papers and his support for NYC 9/11 Ballot Initiative Campaign, a grassroots group seeking to place an initiative on the ballot of the November 6th general election allowing registered New York City voters to create a new commission to investigate 9/11.
http://www.democracynow.org/2008/6/17/former_senator_mike_gravel_calls_for
His interview is about 30-35 minutes into the program. The interview before Mike was also very good so you might just want to watch that too. It is a soldier who is refusing to report to duty to fight in the illegal occupation of Iraq.