My favorite:
There's No Reason To Bomb Saddam! : Just because Hussein is a psychopathic dictator who gassed the Iranians and his own people, fought against the United States, tried to assassinate a US President, has massive stockpiles of WMD, is seeking nukes, and has ties to terrorists doesn't mean he's dangerous.
My favorite dodge has got to be the overworn "It'll be another Viet Nam!" bit. No disrespect at all meant to VN vets on this, but it drives me nuts when presumably smart folk compare a counterinsurgency jungle war, run by a corrupt Democrat to an open-country conventional war run by an honest Republican, almost four decades later. Do they not see ANY difference at all? C'mon, people, WORK with me here!
It has been said of the leftists of that era that they "cannot learn and cannot forget". How true. Their lives were wrapped up tightly protesting the war in VN, to the point that it became the reason for their existence. Thus, the Left tends to view ANY use of American power through that prism, no matter how irrational or wrong-headed it may be. A lot of them, I'm convinced, would like those "sex-love-dope" times back.