Indianapolis. Maine Incumbent Democrat Edmund Muskie won re-election to a fourth term over Republican Robert A. G. Monks, shareholder activist. Maryland Incumbent Republican Glenn Beall, Jr., ran for re-election to a second term, but was defeated by Democratic challenger Paul Sarbanes, member of the U.S. House of Representatives. Massachusetts Incumbent Democrat Ted Kennedy won re-election to his fourth (his third full) term over Republican businessman, Michael Robertson. Michigan Incumbent Democrat Philip Hart retired instead of seeking a fourth term. Democrat Donald Riegle, member of the U.S. House of Representatives, won the open seat over fellow congressman Republican Marvin Esch. Minnesota Incumbent Democrat Hubert Humphrey won re-election to a fifth term over Republican Gerald Brekke, college professor Mississippi Incumbent Democrat John C. Stennis won re-election to his sixth term. Missouri Incumbent Democrat Stuart Symington retired, instead of seeking a fifth term. Republican John Danforth, Attorney General of Missouri, won the open seat, defeating Democrat Warren Hearnes, former Governor of Missouri. (Jerry Litton had won the Democratic nomination earlier, but was killed in a plane crash, and Hearnes was chosen by the party committee.) Montana Rather than seek a fifth term, Democratic incumbent Mike Mansfield opted to retire, creating an open seat. United States Congressman John Melcher, who had represented Montana's 2nd congressional district from 1969 to 1977, won the Democratic nomination and defeated Stanley C. Burger, the Republican nominee and former executive officer of the Montana Farm Bureau Federation, by a wide margin in the general election. Nebraska Incumbent Republican Roman Hruska retired instead of seeking another term. Democrat Edward Zorinsky, Mayor of Omaha, won the open seat over Republican John Y. McCollister, U.S. Congressman of Nebraska's 2nd congressional district. Nevada Incumbent Democrat Howard Cannon won re-election to a fourth term over Republican David Towell, U.S. Representative from Nevada's At-large congressional district. In the Senate, Cannon was known as a moderate in the Democratic Party. He served as chairman of several committees, including the rules committee and the inaugural arrangements committee. Cannon was nearly defeated for re-election in 1964 by Republican Lieutenant Governor Paul Laxalt in one of the closest election in history. However, he became more popular over the next few years and won re-election in 1970 with nearly 58% of the vote. In 1976, he faced U.S. Representative David Towell, who served just one term in the U.S. House of Representatives before running for the U.S. Senate. Cannon won