Professor Jason Mazzone, a constitutional law expert, spoke to the ABC affiliate in Chicago in advance of the election.
"I think it's probably the case that even after one night, we're not going to know Wednesday morning, who's won the presidential race, unless the margin of victory for one of the candidates in the states that are in play looks so strong that all of these absentee ballots, mail in ballots, that will remain to be counted couldn't possibly make a difference that would be sort of the only scenario. I suspect that's not going to be the case. And so it will be sometime before we know the outcome," said Mazzone.
Watch Mazzone's full interview at abc7chicago.com.