New Mexico has three seats in the House, apportioned according to the 2000 United States census. Its 2007-2008 congressional delegation consisted of two Republicans and one Democrat. All three incumbents chose to vie for New Mexico's open Senate seat being held by retiring Republican Pete Domenici. The election resulted in all three New Mexico seats are being occupied by freshman Democrats. Districts 1 and 2 changed from Republican to Democratic; CQ Politics had forecast that these seats might be at risk for the Republican Party. This was the last time that Democrats won all of New Mexico's congressional districts until the 2018 midterm elections. Incidentally, two of the three elected Representatives, Heinrich and Luján, now serve together in the United States Senate since 2021.