Oliver Burkeman captures what's in my head:
Personally, I'm more worried about withdrawal symptoms: not the identity of the winner, but the abrupt halt, after so many months, of the race. It's hard to imagine the day will come when I won't be interested to know about a three-point shift in the voting preferences of white Catholics in Virginia, or the scale of the Republican National Committee's TV advertising purchases in Colorado, but presumably it will. Actually, a scarier thought: maybe it won't. Come 2010 - as the ever more greying President Obama dials back on another policy promise, citing the absence of funds - perhaps I'll still be sitting in a darkened room, compulsively checking TalkingPointsMemo.com and the Gallup daily tracking poll, over and over, like a conditioned laboratory rat, or a formerly captive bear that doesn't realise it's been freed.