Yes, pre-emption against a serious known terrorist threat who had already committed numerous terrorist attacks against US interests, who was actually under an arrest warrant, who we had already attempted to assassinate and who we will probably soon find out we had very specific and direct info that an attack was imminent. That qualifies for "pre-emptive" action for which I, and I don't think anybody, has a probelm with.
Contrast this to Iraq, which had nothing to do with the doctrine of pre-emption. Iraq was a PREVENTIVE war at best, not pre-emption. Iraq was not a direct or imminent threat to the US and it was not in our best interests to invade.
Pre-emption and prevention and the like are not black-and-white for it or against it type things. You need to be able to discriminate and think a little. As hgas been said, it requires doing "nuance". This President, and obviously the posters above, don't do nuance very well. That's a shame. Clark is obviously a brilliant guy and has been a foremost expert on counterterrorism for decades serving prominent roles in 2 previous Repub Admins. But somehow now the guy is a blithering idiot because he dares question the Boy King.