Counter to the findings of a Marist Poll conducted at around the same time that found Trump leading among young voters and trailing with older ones, Mason-Dixon found Harris leads by 1 point with voters 18-49, while Trump leads by 4 points with voters 50-64 and by 10 points with 65-and-older voters.

Election Day is Nov. 5. But early voting is set to begin in just days in Duval, St. Johns, Clay and Nassau counties. Here's what you should know.