Campaign for a Strong Colorado, a coalition of progressive political groups in the state, is calling on U.S. Senate candidate Ken Buck to release a document drafted by an attorney for his campaign defending him against a campaign finance complaint. The complaint (pdf), written by Charles Grice, has been public since it was filed with the Federal Election Commission in May. It has been the subject of discussion in the political blogosphere, on talk radio shows and in the mainstream press, but Buck has played down the charges leveled by Grice and Buck's campaign denied requests by the Colorado Independent this month to make its defense public.