Whereas I've been puzzled and undecided concerning who is the real John McCain, Paul Krugman lays out his opinion on the matter:

The bottom line is that Mr. McCain isn't a moderate; he's a man of the hard right. How far right? A statistical analysis of Mr. McCain's recent voting record, available at www.voteview.com, ranks him as the Senate's third most conservative member.
<..>
He isn't a straight talker. His flip-flopping on tax cuts, his call to send troops we don't have to Iraq and his endorsement of the South Dakota anti-abortion legislation even while claiming that he would find a way around that legislation's central provision show that he's a politician as slippery and evasive as, well, George W. Bush.

He isn't a moderate. Mr. McCain's policy positions and Senate votes don't just place him at the right end of America's political spectrum; they place him in the right wing of the Republican Party.

And he isn't a maverick, at least not when it counts. When the cameras are rolling, Mr. McCain can sometimes be seen striking a brave pose of opposition to the White House. But when it matters, when the Bush administration's ability to do whatever it wants is at stake, Mr. McCain always toes the party line.

While on Krugman, he also recently wrote about the growing number of conservative voices who are jumping ship and criticizing Bush, and how they don't deserve to be called "brave" or "courageous":

If you're a former Bush supporter who now says, as Mr. Bartlett did at the Cato event, that "the administration lies about budget numbers," you're a brave truth-teller. But if you've been saying that since the early days of the Bush administration, you were unpleasantly shrill.

Similarly, if you're a former worshipful admirer of George W. Bush who now says, as Mr. Sullivan did at Cato, that "the people in this administration have no principles," you're taking a courageous stand. If you said the same thing back when Mr. Bush had an 80 percent approval rating, you were blinded by Bush-hatred.

And if you're a former hawk who now concedes that the administration exaggerated the threat from Iraq, you're to be applauded for your open-mindedness. But if you warned three years ago that the administration was hyping the case for war, you were a conspiracy theorist.

The truth is that everything the new wave of Bush critics has to say was obvious long ago to any commentator who was willing to look at the facts.