In every midterm election since the Civil War, the president's party has lost, on average, 32 seats in the House and two in the Senate.

In every midterm election since the Civil War, the president's party has lost, on average, 32 seats in the House and two in the Senate.

In next year's battles, Democrats need only 24 seats to flip the House and two to take the Senate. Read more: https://t.co/jN6mILmwih pic.twitter.com/FDngpm1osR

— NBC News (@NBCNews) December 29, 2017