How often do senators run for office?

Answer 1

Every two years, in every even-numbered year, about one third of all Senate seats, representing about two thirds of all of the states, come up for election. No one state elects both of their U.S. Senators in the same years, except in some cases when a special election is required to fill a vacancy. Senators whose seats come up for election in 2014 are known as Class 2 Senators, Senators whose seats come up for election in 2016 are known as Class 3 Senators, and Senators whose seats come up for election in 2018 are known as Class 1 Senators.

Answer 2

Senators- run every 6 years

House- run every 2 years