leader of the bus tours to write what he thought was a sat tear kel letter from the head of naacp to abraham lincoln. over the weekend, a spokesman for another tea party group, the national tea party federation said they had had enough. >> we in the last 24 hours have expelled tea party express and mark williams from the national tea party federation because of the letter that he wrote which he, i guess, may have considered satire but which is clearly offensive. self-policing is the right and responsibility of any movement or organization. >> reporter: now, mark williams, he says he is finished giving interviews on the subject and cancelled an appearance on cnn yesterday but he did release a statement slamming the national tea party federation. he says, apparently i have offended the tea party