It is Election Day, Tuesday, Nov. 3, and both chambers of Congress are in play. Here is what to know, based on NPR's reporting.
Turnout so far. More than 54 million people had already voted before Tuesday. That is nearly half of all the ballots cast in the last midterm. NPR says Democrats hold a double-digit edge in early voting data, but Republicans tend to vote heavily in person on Election Day, so Tuesday's turnout matters a lot.
The House. Democrats are favored to win the House. They need to flip only three seats. Republicans tried to protect themselves with rare mid-decade redistricting, but NPR says that likely will not be enough.
The Senate. The Senate is much less certain. Democrats need to gain four seats for control. They are favored to flip North Carolina, but the other key races are toss-ups or lean Republican. Apart from Maine, the toss-up Republican seats are in states President Trump won by double digits. Races to watch include Iowa, Kansas, Ohio, Texas, Alaska and Maine, while Republicans' top target is Michigan. NPR says high Republican turnout could hold Democrats to one pickup, while low turnout could lead to a much bigger Democratic night.
Governors. There are 36 races for governor, including close contests in Georgia, Nevada and Ohio.
When results come in. The first polls close at 6 p.m. Eastern, 5 p.m. Central, in parts of Kentucky and Indiana. Many close races may not be decided Tuesday night. It could take days or even weeks to count every ballot.
In Tennessee. Polls in Tennessee close at 7 p.m. Central. Voters in line at closing time can still vote.
Sources: NPR, ABC News, Associated Press