As defined by every dictionary I consulted, Haggard is not a hypocrite. For example, the American Heritage Dictionary of the English Language (Fourth Edition) defines hypocrisy as "The practice of professing beliefs, feelings or virtues that one does not hold or possess."
But we know that the Rev. Haggard never professed a belief that he did not hold. He believed at the time of his homosexual activities, and he believes now, that homosexual sex is a sin. He readily concedes that, in his view, he was sinning when he engaged in homosexual sex. He may therefore be considered a sinner, a person who acted inconsistent with his own admonitions and a poor model for a clergyman, but he is no more a hypocrite than a reverend who teaches the Ten Commandments and dishonors his mother or father, or bears false witness or even commits adultery. Hypocrisy requires a person to believe that he is the exception to the rule that he espouses for everyone else; that behavior that is wrong for others is not wrong for him.
If everyone who violates a standard he advocates is a hypocrite, the word is meaningless. And worse, it makes it impossible for just about anyone to advocate moral behavior.
The arguments against redefining marriage, the central institution of society, are profound and decent, no matter what the sexual orientation of those who offer those arguments. The sexual confusion we will bequeath to future generations, especially among children, if the same sex is regarded from childhood as equally desirable as marriage partners, endangers society immeasurably more than global warming.
But while not a hypocrite, the reverend was extremely irresponsible. By not resigning from his position (for "family reasons," "personal reasons" or myriad other believable excuses) the moment he began his homosexual liaison, he endangered the entire defense of marriage movement, something infinitely more important than his staying in power, and, in my opinion, more sinful than his sexual sin.
That said, anyone who changes his mind and decides to vote against a proposition defining marriage as man-woman because a prominent Christian leader was exposed as privately engaged in homosexual behavior is not thinking clearly. Worse, he is rewarding the loathsome tactic of weekend-before-elections humiliations of public figures. One hopes that even proponents of same-sex marriage can agree that is no way to win elections.
In the meantime, however, those who argue for redefining marriage have their bases covered with ad hominem attacks. According to same-sex marriage activists, if you're a heterosexual who opposes same-sex marriage, you're a homophobe, and if you're a homosexual who opposes same-sex marriage, you're a phony and a hypocrite. Defenders of marriage should not lend credibility to these characterizations.