Midterm elections often have transformed the composition of Congress and altered many policies, while having considerable consequences at state and local levels.
The 2018 midterm election decided 35 of the 100 seats in the U.S. Senate, all 435 seats in the House of Representatives, 39 state and territorial governorships, and numerous state and local elections. Democrats gained 41 seats in the House of Representatives, which gave them a majority in the chamber and ended Republican control of the three major elected portions of the federal government.
President Barack Obama’s presidency faced a similar issue in the 2014 midterm elections, as Republicans retained control of the House of Representatives. Republicans won control of the Senate with a net gain of nine Senate seats, which was the largest Senate gain for either party since the 1980 elections. Republicans won a net gain of 13 seats in the House of Representatives, giving them their largest majority since the Great Depression.