Yes, I briefly considered voting McCain on a single issue: the war. But the two things you mentioned, plus his stance on the border, plus the fact that he's in favor of joining the International Criminal Court, makes him a non-starter for me even on national security.
I've been in bunker mode since the South Carolina returns came in, and am looking toward 2012. In the meantime, I will be voting for every conservative congress critter I can find -- we're going to need them.
McCain doesn’t care how many Americans die as long as he can prove that the Commies were wrong about torturing him.