2018 United States Senate election in New Mexico

The 2018 United States Senate election in New Mexico took place on November 6, 2018, to elect a member of the United States Senate to represent the state of New Mexico, concurrently with other elections to the United States Senate, elections to the United States House of Representatives, and various state and local elections.

Incumbent Democratic Senator Martin Heinrich won re-election to a second term. His opponents were Republican nominee and businessman Mick Rich and Libertarian nominee Gary Johnson, a two-term Republican Governor of New Mexico and two-time candidate for President of the United States.

The candidate filing deadline was March 13, 2018. The Republican and Democratic primary elections were held June 5, 2018. Johnson's results were the highest results for a Libertarian candidate in New Mexico history.

Nominee

 * Martin Heinrich, incumbent U.S. Senator

Nominee

 * Mick Rich, businessman

Declined

 * Aubrey Dunn Jr., New Mexico Commissioner of Public Lands and candidate for NM-02 in 2008 (ran as a Libertarian, later endorsed Gary Johnson)
 * Steve Pearce, U.S. Representative, candidate for the U.S. Senate in 2000 and nominee for the U.S. Senate in 2008 (ran for Governor)
 * Susana Martinez, Governor of New Mexico

Libertarian primary
On July 30, 2018, nominee Aubrey Dunn withdrew from the race. On August 4, former governor Gary Johnson was formally nominated by the Libertarian Party of New Mexico as Dunn's replacement. Johnson accepted his party's nomination on August 13.

Declared

 * Gary Johnson, former Governor of New Mexico, Libertarian nominee for president in 2012 and 2016

Withdrew nomination

 * Aubrey Dunn Jr., New Mexico Commissioner of Public Lands

Debates

 * Complete video of debate, October 12, 2018

Predictions
^Highest rating given

Polls

 * with Mick Rich


 * with Gary Johnson


 * with Aubrey Dunn

County results

 * Counties that flipped from Republican to Democratic
 * Hidalgo (largest municipality: Lordsburg)
 * Los Alamos (largest municipality: Los Alamos)
 * Sandoval (largest municipality: Rio Rancho)
 * Valencia (largest municipality: Los Lunas)

Results by congressional district
Heinrich won all 3 congressional districts.