Credit: There are also several toss-up Senate races this year that will determine whether the Senate remains in Republican hands or is taken by a Democratic majority.

The races that could determine who controls the Senate

What went wrong with polls in 2016? Can we trust them now?

It’s getting too late to mail ballots, Md. election official says

How did we get the Electoral College, and why do we still have it?

The Hunt: Will there be postelection violence?

Your mail-in ballot status? Montgomery County wants to calm worried voters