The seven swing states have a combined total of 93 Electoral College votes, or 17.3% of the total, with both candidates devoting huge amounts of time and money trying to win them.

The system allocates 538 votes across the country, and a candidate needs a majority, or 270 votes, to win. Here's how the Electoral College works. The college is the way American voters indirectly choose the next president and vice president through each state's electors.