Also a factor here are the tribal factions, some of which have threatened to reignite the insurgency if their interests aren't served properly in the voting results.
Add to all this the vote-buying, intimidation, and assassinations reported over the last few weeks, and the reports (and rumors - which might as well be factual reports) of fraud that will surely emerge after tomorrow . . . . Well, let's just say that the next few weeks, and how the entire process shakes out, are going to be extremely interesting.