Here's my take on the final McCain-Obama duel, first posted at MotherJones.com....

A political campaign can be like a rock slide. At some point, it's just going to continue in the direction it's heading--and not much can stop it. After the final debate between Senator Barack Obama and Senator John McCain, it may well be that the 2008 presidential contest has reached not the tipping point, but that rock slide point. This is not a prediction of a pro-Obama avalanche on November 4--though that's a possibility. It's merely an observation that the campaign may be done in the sense that there are no major inputs to come (barring a bolt-from-the-blue event) that will affect the final tally. Polls will show that there are still some undecided voters out there. (Who are these people?) But whatever's going to determine this election--economic concerns, a desire for change, racism, you name it--is probably already in place, and the candidates may not be able to alter this, at least not in a proactive manner. Certainly, at any time, either can turn the race upside down by saying or doing something particularly dopey.

Neither got dopey on Wednesday night. McCain even had his best (or his least unsuccessful) debate performance, but it was no--damn, I hate this cliché--game changer. McCain was more aggressive than in the previous face-offs, and he finally dared to challenge Barack Obama directly on the--drum roll, please--Bill Ayers Question. But there was this: viewers watching McCain's reaction shots during the evening could have easily wondered if the Republican presidential nominee would make it to the finish without his head exploding, for he seemed to be in the midst of an exercise in anger control.

Prior to the debate, there was much chatter about whether McCain would play the Ayers card. Judging from video of his recent rallies, it appeared that his base was demanding blood on this front. But polls indicated that these sorts of attacks have been hurting McCain with in-the-middle voters. So he faced a tough decision: ignore Ayers and upset the diehards or accuse Obama of being a pal of a domestic terrorist and alienate the indies.

McCain and his strategists came up with a hybrid approach: take a shot on the Ayers front and combine it with a traditional political assault. "I don't care about an old washed-up terrorist," McCain huffed, but then he went on to say, "we need to know the full extent of that relationship." Huh? If you don't care about Ayers, why do you care about the relationship? And why repeat the false claim that Obama launched his first political campaign within Ayer's living room?

This was essentially McCain's love letter to the GOP base. ("Now get off my case, okay?") More important, he attached it to his true attack of the night: Obama will raise your taxes. After quickly running through his Ayers index cards, McCain noted, "My campaign is about getting this economy back on track...I'm not going to raise taxes the way Senator Obama wants to raise taxes." In what was probably the last big moment of the campaign before Election Day, McCain offered this meta-argument: Obama is a liberal tax-and-spend Democrat, and I'm a conservative. (He left off the Republican part.)

Repeatedly, McCain accused Obama of wanting to throw money at problems and of yearning to raise taxes. When Obama maintained he would give tax breaks to the bottom 95 percent--and more tax relief than McCain would to this large slice of the American public--McCain replied: hey, this guy wants to raise taxes. And, by the way, he wants to spend your money.

Crunch time for McCain? Perhaps--for on Wednesday night at his final debate with Barack Obama, John McCain has a do-or-die decision to make. To Atwater or not to Atwater--that is the question. (If you're too young to get the Atwater reference, look it up.) And whatever his answer is, McCain is poised to disappoint--perhaps alienate--one of two crucial blocs of voters.

The Republican party's base wants blood. They cannot believe that a former community activist (read: Socialist!) with barely a moment's experience in Washington who is a secret Muslim and quasi-Black Panther is close to the presidency. For them, the association game--tying Obama to former, bomb-throwing radical Bill Ayers and extreme-rhetoric-hurling Jeremiah Wright--ought to be a fundamental part of the McCain campaign, for these connections reveal the real Obama. Obama, they contend, is fooling the voting public by coming across as a mainstream, composed, confident politician who reasonably talks of consensus-building and change. In their view, he is both the embodiment of the evils of the 1960s and Islamofascism. A sleeper agent. A Manchurian candidate from Mecca. But he is so skilled at keeping his true loyalties covert, he can only be exposed via his ties to Ayers and Wright. This is not guilt by association or the petty politics of personal destruction. It's the key to decoding Obama. Its what must be done so the Republic does not fall into the hands of an internal enemy.

And it was only a few days ago that McCain and Sarah Palin were on the Ayers trail. She accused Obama of "palling" around with domestic terrorists. (She used the plural.) McCain promised a supporter he would raise this connection at the final debate.

But recent polling has indicated that McCain's attacks on Obama have lost him support among voters. More voters see McCain as the more negative of the two candidates and less concerned with issues than Obama. McCain's assaults are simply not working--especially when tethered to McCain's erratic moves regarding the economic crisis. So if he goes all Ayers (or Wright) on Obama, he faces a real risk: pissing off indie and uncommitted voters. But, then, if he holds his fire on this front, he will anger the die-hard conservatives who want to see him pummel Obama and expose the true Obama to the entire world.

John McCain offers his newest lurch today.

In a speech he is scheduled to give in Virginia Beach on Monday, McCain says 17 times that he will fight for America, according to his prepared remarks. He repeatedly calls himself a "fighter." And he's an experienced fighter who won't--like you know who--have to study up on issues before making command decisions.

Over and over in this new stump speech, McCain says he is ready to fight--for the country, for change, for a new direction, for the future, for the children, for justice for all. Seriously.

Times are tough, McCain notes, but America is worth fighting. It needs a fighter like John McCain, who is a real fighter who has always been a fighter for America.

In other words, vote for the fight guy. Here's how the speech ends: