I've written about it here, and now Democrat Bob Kerrey is discussing the same hypocrisy here:
Bob Kerrey to Dems: Why are U.S. troops the answer in Darfur but not in Iraq?
Suppose we had not invaded Iraq and Hussein had been overthrown by Shiite and Kurdish insurgents. Suppose al Qaeda then undermined their new democracy and inflamed sectarian tensions to the same level of violence we are seeing today. Wouldn’t you expect the same people who are urging a unilateral and immediate withdrawal to be urging military intervention to end this carnage? I would.
and about those terrorists in Iraq?
With these facts on the scales, what does your conscience tell you to do? If the answer is nothing, that it is not our responsibility or that this is all about oil, then no wonder today we Democrats are not trusted with the reins of power. American lawmakers who are watching public opinion tell them to move away from Iraq as quickly as possible should remember this: Concessions will not work with either al Qaeda or other foreign fighters who will not rest until they have killed or driven into exile the last remaining Iraqi who favors democracy.
Update: Think Progress bashes Kerrey: Bob Kerrey: Wrong Before Going Into Iraq And Still Wrong Today