The Maverick’s buck stops here.

John McCain is no longer the media’s delight and his party’s burr, bucking convention with infectious relish.

The man used to be such a constructive independent that some of his Republican Senate colleagues called him a traitor. Now he’s such a predictable obstructionist that he’s in the just-say-no vanguard with the same conservatives who used to despise him.

On Tuesday afternoon on the floor, Senator Mitch McConnell, who contemptuously fought McCain’s campaign finance reform bill all the way to the Supreme Court, oozed admiration toward his Arizona colleague, as McCain did yet another grandstanding fandango on the health care bill.

Watching him, one can only wonder: Is McCain betraying his best self? Who is the real McCain?

Even some of McCain’s former aides are disturbed by the 73-year-old’s hostile, vindictive, sarcastic persona  a far cry from The Honorable Man portrait so lovingly pumped up in books by his former aide and co-writer Mark Salter.