From NBC's Kelly O'Donnell and Mark Murray A longtime friend and campaign fundraiser for Fred Thompson, Philip J. Martin, has resigned his role in Thompson's campaign. The Washington Post reported over the weekend Martin had drug-related convictions dating back to the 1970s, and more recently Martin has had issues with the IRS including tax liens. Martin had been providing use of his aircraft for Thompson to travel, and advisers tell NBC News that Thompson is not traveling on that aircraft today. The campaign has issued this statement form Martin: "I have decided to resign my position as Chair of 'First...