The guy served four presidents, the last two in the capacity of chief counter-terrorism person, until this current president drove him crazy with his indifference to hair-on-fire warnings. But if there’s such a thing as an expert on the subject, he’s it.
Yes, he’s something of a prima donna, an alarmist, and may even be (horrors!) gay, for all I know. Doesn’t matter. He has the one (1) qualification that in this case trumps all objections, including whatever snark-du-jour the Bush defenders fire off in their ongoing efforts to cut him down personally while avoiding his actual arguments. And that one qualification is this: his Cassandra-esque warnings were proven right on September 11. So cut the crap about how you just don’t like his taste in ties, or whatever, and go read what Richard Clarke has to say about how this whole War on Terror thing is going seriously wrong: The wrong debate on terrorism.