US election 2020: Can the polls pick a winner?

As the US enters the final hours of voting in its 2020 election, what are the numbers showing? Which races are too close to call, what impact will such a large amount of early voting have on the result and - after 2016's predictions - is it really possible to accurately pick a winner? Kathryn discusses this with Professor Michael McDonald, an expert on early voting, who is running the US Elections Project - a turnout-tracking database run by University of Florida and G. Terry Madonna, professor and pollster at the popular Franklin and Marshall College Poll based in Lancaster, Pennsylvania.