Yes, fine, whatever. Background blah blah blah. The real question regarding your credibility is whether or not you like George Bush. If "yes," you are totally a partisan hack and not to be believed. If "no," you are completely objective and unbiased and worthy of being quoted.
Actually, merely failing to like GWB is not sufficient to be considered objective, you have to hate him to the very core of his bones before you can be considered truly objective and unbiased.