Multiple choice Every two years, congressional elections are held for which seats? All of the House of Representatives & all of the Senate A third of the House of Representatives & all of the Senate All of the House of Representatives & a third of the Senate A third of the House of Representatives & Senators named Bob Reveal answer Fill a bubble to check yourself C Correct answer Explanation All seats in the House of Representatives are up for election every two years, while only about one-third of the Senate seats are up for election in any given cycle.