The problem I see is that if it's close, Kerry won't give his concession speech, but will claim fraud and rally up the people and all hell could possibly break loose. I've heard that there will be lawyers at many polling stations just waiting for the smallest reason to slap a lawsuit on someone. I just hope these polling places will be able to handle the turnout. I also predict that there will be problems such as polling stations keeping their doors open late, late enough for the last bus load of libs rounded up from the inner city with their free carton of cigs a chance to vote for Kerry. People will also come to the polls to find out they aren't registered and the news media will have a fit over this.
I don't expect riots on polling day, but I do expect massive vandalism to anyone who has a bush sticker on their car or in their yard. I expect at least a few attacks, and shootings in the name of self defense, because we know the Kerry supporters will be up all night after he looses, cracked out on weed and coke and tearing up property and just generally throwing a tantrum.