My prediction is that Obama will win - anything else will be the beginning of civil war in the US.
McCain can't win without a Bush v. Gore redux AND no Obama supporter would tolerate anything less not even for one minute with polls showing Obama over the 5 point lead. There is a method to Obama telling everyone to get out an vote and early votes show strong Obama support. No stealing an election. Any other outcome will be seen as overthrow of democracy, an outright act of theft, like the post evidence that we all know occurred during Bush V. Gore and what Florida did to African American voters.