The race for the White House has gotten so close, there's a possibility -- albeit a very slight one -- the whole thing could end in a tie.
And a 269-269 electoral-vote tie could make the disputed 2000 election look like a cakewalk.
There is a narrow scenario in which neither President Obama nor Mitt Romney would get the 270 electoral votes required to win.
If that were to happen, Democratic strategist Joe Trippi says it would create political drama -- as the Republican-controlled House would pick the president and the Democrat-controlled Senate would pick the vice president, likely resulting in a bipartisan ticket.
"The Senate picks who the vice president is. It would probably be still in Democratic hands and would pick Joe Biden. So you would have a Romney-Biden ticket. ... it would be one crazy finish to one crazy election year," Trippi told Fox News.
Former Bush adviser Karl Rove, who is very familiar with close presidential races, said the scenario is "highly unlikely," but "never say never particularly in a race this close."
"I think the odds of it are, you know, approaching ... 1 percent or less, but you know this has been a crazy election," he said.
Experts say the more likely -- but still unusual -- scenario would be one candidate winning the popular vote, while the other wins the electoral vote.
"You could have a situation where someone wins the popular vote and yet because one state or two states don't move exactly in tandem with the national change up or down ... the other candidate with the minority of the vote wins the electoral college," Rove told Fox News.
That's what happened in 2000 between Bush and Al Gore.
If that were to happen between Obama and Romney, Trippi noted, the outcome is obvious.
"If somebody wins the popular vote and somebody wins the electoral vote, the Constitution is very clear -- the person who won the electoral vote wins. There will be controversy, but there shouldn't be. It's very clear," Trippi said.