Jim at Bethune Catholic has a post up about litmus tests.
He brings up a good point about how the war in Iraq has somehow assumed some sort of symbolic importance it doesn't deserve.
I remember seeing that played out when Mark Shea and NRO's Mike Potemra got in a testy little cat fight that had nothing to do with Iraq, but Potemra brought up that Shea was against the war and Mark mentioned some sort of neocon canard. I hadn't seen so many non-sequitors since Thomas Jefferson dined alone.
Reasonable people disagreed at the time of the invasion whether it was legitimate. Unreasonable people have forgotten that, now that the war has proved to have been a tragic mistake.