Any discussion of "fact" vs. "opinion" must consider that the facts of the various Congressional and UN votes and of the public opinion polls were seriously skewed by the information coming out of the Whitehouse and from the political appointees who were massaging the intelligence estimates being produced by the CIA, DIA and others to give the desired results. Any "opinion" that the data on the table in 2002-2003 was factual has been, I hope, long since been changed by new facts as they have emerged.