I missed this yesterday, but Adam Blickstein notes John McCain absurd argument that we should ignore his record of catastrophic misjudgments on vital issues of national security:
We can look back at the past and argue about whether we should have gone to war or not, whether we should have invaded or not, and that's a good academic argument.
Over 4,000 people died in this academic arguments. People need to use the term "trillion" to express its fiscal cost. And, obviously, the question about whether or not it was a good idea speaks to some important points of doctrine and theory. This isn't like quibbling over some vote on some amendment back in 1983, it was the biggest national security policy decision of the current era.