In 2004, Salazar declared his candidacy for the U.S. Senate seat being vacated by retiring Republican Senator Ben Nighthorse Campbell. Salazar considers himself a moderate and has at times taken positions that are in disagreement with the base of his party—for example, he opposed gay adoption for a number of years, although by 2004 he had reversed that position. Salazar fell behind to candidate Mike Miles early in the state's caucus process. The national Democratic Party backed Salazar with contributions from the DSCC, and Salazar came back to defeat Miles in the Democratic primary, going on to defeat beer executive Pete Coors of the Coors Brewing Company and win the general election for the Senate seat. His elder brother John also had an electoral victory in 2004, winning a race for the U.S. House of Representatives from Colorado's 3rd congressional district.