I have far more respect for McCain than I have, or ever expect to have, for GWB. But as to the question:

About four years ago, I was driving home from work when I heard, for the first time, an actual tape of LBJ discussing the Vietnam situation on the phone. There was nothing there I didn't know, but I had never heard it in that direct way before. LBJ said in so many words that he knew we couldn't win in Vietnam, militarily or diplomatically. But he kept sending our men to die. I had to pull over and park until I could stop crying.

GWB, when asked what lesson should be learned from Vietnam, has said, "Don't quit". He has lied, possibly even to himself, about the realities of Iraq from beginning to present.

McCain has continued to back GWB, and to give every indication that he believes a military victory in Iraq is possible. I consider him a basically honest man and a patriot. But I can't fault anyone for calling him "McWar".