2008 United States presidential election in New Mexico

• 2008 New Mexico Democratic primary
• 2008 New Mexico Republican primary

The key voting bloc in this state is Hispanics, which make up a plurality of the state's total population with 45%. George W. Bush received over 40% of the Hispanic vote nationally in 2004. This support was enough for Bush to nip John Kerry by approximately 6,000 votes in New Mexico in 2004. In the previous two elections, New Mexico had been a very close swing state. Al Gore won the state by 300 votes in 2000, which was even narrower than the controversial results in Florida. However, after the 2004 presidential election, support for Republicans in the Hispanic community collapsed. During the 2008 election, New Mexico was regarded as an Obama-leaning state although John McCain was from neighboring Arizona and held similar views on illegal immigration to those of Bush. Ultimately, McCain obtained 30% of the Hispanic vote.

Native Americans also represent a key voting demographic in New Mexico.[19] Obama won the Native American vote, 78–21%, and carried most of the counties within the confines of the Navajo Nation.[20]

The Republican base in New Mexico consists of the more rural southeastern part of the state which, while thinly populated, votes heavily Republican. Democrats are strongest in the state capital, Santa Fe, and its close-in suburbs. The city of Albuquerque and the southwestern part of the state both lean Democratic, but not as overwhelmingly as does Santa Fe. On a larger context, Southern New Mexico is typically more Republican while Northern New Mexico is traditionally more Democratic, while Albuquerque and other areas in the center tend to swing both ways.

In 2008, Obama carried the state by a 15-point margin, largely by dominating the Albuquerque area. He won Bernalillo County, home to Albuquerque itself, by 21 points; Kerry had won it by four points in 2004. While McCain dominated the southeastern part of the state, it was not nearly enough to overcome Obama's edge in the Albuquerque area.[21]

During the same election, former Democratic U.S. Representative Tom Udall, who had represented New Mexico's 3rd Congressional District in the U.S. House of Representatives, defeated former Republican U.S. Representative Steve Pearce, who had represented New Mexico's 2nd congressional district, for an open U.S. Senate seat that was vacated by Republican Pete Domenici once it was discovered that he had brain cancer. Former Republican U.S. Representative Heather Wilson, who represented New Mexico's 1st Congressional District, vacated her seat to challenge Pearce in the GOP senatorial primary only to lose the nomination to him. As a result, all three of New Mexico's U.S. House seats were up for grabs, and Democrats captured all three of them. At the state level, Democrats increased their majorities in both houses of the New Mexico Legislature, picking up three seats in both the New Mexico House of Representatives and New Mexico Senate.

As of the 2016 presidential election, this is the last election in which Luna County voted for the Democratic candidate.

Officially the voters of New Mexico cast their ballots for electors: representatives to the Electoral College. New Mexico is allocated five electors because it has three congressional districts and two senators. All candidates who appear on the ballot or qualify to receive write-in votes must submit a list of five electors, who pledge to vote for their candidate and his or her running mate. Whoever wins the majority of votes in the state is awarded all five electoral votes. Their chosen electors then vote for president and vice president. Although electors are pledged to their candidate and running mate, they are not obligated to vote for them.[22] An elector who votes for someone other than his or her candidate is known as a faithless elector.

The electors of each state and of the District of Columbia met on December 15, 2008, to cast their votes for president and vice president. The Electoral College itself never meets as one body; instead the electors from each state and the District of Columbia meet in their respective capitols.

The following were the members of the Electoral College from the state. All five were pledged to Barack Obama and Joe Biden:[23]

1. Brian Colon
2. Annadelle Sanchez
3. Tom Buckner
4. Christy French
5. Alvin Warren