Not only is it not over. The mainstream media will invent a McCain "surge" in the next two weeks. "Legitimate" talking heads will declare that Obama's past associations are fair game; that his meeting with Iraqi government officials constituted dirty politics; that his economic plans will exacerbate the recession. Less-legitimate pundits will spin race enthymemes designed to scare already nervous whites into reconsidering their choice. McCain will appear fully rehabilitated, lucid and reasonable (by comparison to earlier McCain) on Wednesday's debate, and the mainstream media will declare that a victory for him. People will begin to say that Obama peaked to early, and remind us that he's always had a hard time "closing the deal." Perhaps some of Biden's flaws will be highlighted for good measure.
Then, the purging of voter rolls will begin. Already, millions of minority voters are receiving fliers from mysterious sources telling them that they'll be intimidated by cops if they show up to vote. Many will find that they can't vote at all. In many precincts it won't matter if they show up, because their votes will mysteriously disappear. All this could happen and Obama could still win. But I would be surprised, nonetheless, if many of these things did not happen.