Probably not the case, but Fallows' argument isn't too shabby:
For a candidate coming from behind, every second of the final week of
the campaign is like a second in cardiac-surgery operating theater,
with absolutely no room for fooling around or wasting time, money, or
effort that could be used to sway that last crucial vote. (Think: the
last days of Gore-Bush in 2000.)
For a candidate who thinks he's ahead, and might actually become president, inevitably there's a tone of new seriousness right at the end: What we've been working for years is within our grasp, let's not screw this up, and let's be sobered by how different the world is going to look in a few days.
Fallows generally leaves me cold, but he's absolutely correct on this one. McCain's known he's going to lose for at least two weeks, and is trying to do some road repair with his "base," the media. God knows why.