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 2018 [United States Senate elections|other elections] to the United States Senate, 2018 [United States House of Representatives elections|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.

Democratic primary

Candidates

Nominee

Martin Heinrich, incumbent U.S. senator

Republican primary

Candidates

Nominee

Mick Rich, businessman

Declined

Aubrey Dunn Jr., New [Mexico Commissioner of Public Lands] and candidate for NM-02 in elections in New Mexico#District 2|2008]
Steve Pearce, U.S. representative, candidate for the U.S. Senate in 2000 and nominee for the U.S. Senate in 2008
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.

Candidates

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

General election

Debates

, October 12, 2018

Predictions

^Highest rating given

Polling

Polls

with Mick Rich

Poll source	Date administered	Sample size	Margin of error	Martin Heinrich	Mick Rich	Undecided
The Tarrance Group (R-Rich)	July 31 – August 2, 2018	500	± 4.5%	55%	37%	8%
NSON Opinion Strategy (L)	July 2018	500	–	47%	29%	–

with Gary Johnson

Poll source	Date administered	Sample size	Margin of error	Martin Heinrich	Gary Johnson	Undecided
GBA Strategies (D-Heinrich)	August 1–5, 2018	800	± 3.5%	50%	38%	–
In Lux Research (L)	July 28–29, 2018	525	–	40%	42%	–

with Aubrey Dunn

Poll source	Date administered	Sample size	Margin of error	Martin Heinrich	Mick Rich	Aubrey Dunn	Undecided
NSON Opinion Strategy (L)	July 2018	500	–	47%	30%	7%	16%
Carroll Strategies	June 15–16, 2018	1,199	± 2.8%	50%	39%	5%	6%

Results

By county

Counties that flipped from Republican to Democratic

By congressional district

Heinrich won all three congressional districts.

District	Heinrich	Rich	Johnson	Representative
	57.55%	26.28%	16.17%	Deb Haaland
	45.56%	40.17%	14.27%	Xochitl Torres Small
	57.52%	27.0%	15.48%	Ben Ray Luján