The details of today's election in the United States.
House of Representatives: All 435 seats will be put to the vote.
The Senate: 35 seats are put to the vote (33 regular seats and 2 special elections).
Elections for governors: held in 36 countries.
The US Senate has a total of 100 senators, meaning two from each of the 50 states.
But unlike the House of Representatives, the term of office of the senators is six years, and only about a third of the seats are tested every two years.