[1] Incumbent Senator Larry Craig decided to retire instead of seeking a fourth term.

Incumbent Larry Craig announced his intent to resign following an incident where he allegedly solicited another man for gay sex in a public restroom.

Conservative independents Rex Rammell and Pro-Life (formerly Marvin Richardson) also qualified for the general election ballot.

Former Caldwell city council member Kent Marmon secured the Libertarian nomination.

In the general election, Risch defeated LaRocco and the other candidates to keep the seat in Republican hands.