In 1972, Colmer, one of the most conservative Democrats in the House, announced his retirement after 40 years in Congress. He endorsed Lott as his successor in Mississippi's 5th District, located in the state's southern tip, even though Lott ran as a Republican. Lott won handily, in large part due to Richard Nixon's landslide victory in that year's presidential election. Nixon won the 5th district with an astonishing 87 percent of the vote; it was his strongest congressional district in the entire nation.