2016 United States Senate election in Idaho

The 2016 United States Senate election in Idaho was held November 8, 2016, to elect a member of the United States Senate to represent the State of Idaho, concurrently with the 2016 U.S. presidential election, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections. The primaries were held May 17.

Incumbent Republican Senator Mike Crapo won re-election to a fourth term in office.

Declared

 * Mike Crapo, incumbent U.S. Senator

Declined

 * Russ Fulcher, former state senator and candidate for governor in 2014
 * Raúl Labrador, U.S. Representative
 * Mike Simpson, U.S. Representative

Declared

 * Jerry Sturgill, businessman

Declined

 * Richard H. Stallings, former U.S. Representative, former chairman of the Idaho Democratic Party and nominee for U.S. Senate in 1992
 * Larry LaRocco, former U.S. Representative, nominee for lieutenant governor in 2006 and nominee for U.S. Senate in 2008
 * Walt Minnick, former U.S. Representative and nominee for U.S. Senate in 1996

Declared

 * Pro-Life (formerly known as Marvin Richardson), organic strawberry farmer, anti-abortion activist and perennial candidate
 * Ray Writz

Results
[[File:2018 Idaho US Senate Constitution primary.svg|thumb|250px|Results by county: Writz

{{legend|#220b28|Writz—100%}}

{{legend|#672178|Writz—80–90%}}

{{legend|#892ca0|Writz—70–80%}}

{{legend|#ab37c8|Writz—60–70%}}

{{legend|#bc5fd3|Writz—50–60%}} Writz/Pro-Life tie

{{legend|#999999|Writz & Pro-Life tie—50%}} Pro-Life

{{legend|#27c837|Pro-Life—50–60%}}

{{legend|#2ca02c|Pro-Life—60–70%}}

{{legend|#0b280b|Pro-Life—100%}} No votes

{{legend|#000000|No votes}} ]]

Withdrawn

 * Timothy Raty, paralegal and 2004 Libertarian State House candidate

Counties that flipped from Republican to Democratic

 * Blaine (largest municipality: Hailey)