Byrd's favor. Byrd was re-elected to the Senate eight times. He was West Virginia's junior senator for his first four terms; his colleague from 1959 to 1985 was Jennings Randolph, who had been elected on the same day as Byrd's first election in a special election to fill the seat of the late Senator Matthew Neely. While Byrd faced some vigorous Republican opposition in his career, his last serious electoral opposition occurred in 1982 when he was challenged by freshman Congressman Cleve Benedict. Despite his tremendous popularity in the state, Byrd ran unopposed only once, in 1976. On three other occasions—in 1970, 1994 and 2000—he won all 55 of West Virginia's counties. In his re-election bid in 2000, he won all but seven precincts. Congresswoman Shelley Moore Capito, the daughter of one of Byrd's longtime foes, former governor Arch Moore Jr., briefly considered a challenge to Byrd in 2006 but decided against it. Capito's district covered much of the territory Byrd had represented in the U.S. House. In the 1960 Democratic Party presidential primaries, Byrd—a close Senate ally of Lyndon B. Johnson – endorsed and campaigned for Hubert Humphrey over front-runner John F. Kennedy in the state's crucial primary. However, Kennedy won the state's primary and eventually the general election. Public service records Byrd was elected to a record ninth consecutive full Senate term in the November 7, 2006, midterm elections. He became the longest-serving senator in American history on June 12, 2006, surpassing Strom Thurmond of South Carolina with 17,327 days of service. On November 18, 2009, Byrd became the longest-serving member in congressional history, with 56 years, 320 days of combined service in the House and Senate, passing Carl Hayden of Arizona. Previously, Byrd had held the record for the longest unbroken tenure in the Senate (Thurmond resigned during his first term and was re-elected seven months later). He is the only senator ever to serve more than 50 years. Including his tenure as a state legislator from 1947 to 1953, Byrd's service on the political front exceeded 60 continuous years. Byrd, who never lost an election, cast his 18,000th vote on June 21, 2007, the most of any senator in history. John Dingell broke Byrd's record as longest-serving member of Congress on June 7, 2013. Upon the death of former Florida Senator George Smathers on January 20, 2007, Byrd became the last living United States senator from