Pucinski, a Congressman from Illinois's 11th congressional district, Edward C. Gross (SL) and Arnold Becchetti (C). Percy handily won a second term. Iowa The incumbent Republican Jack Miller was defeated by Dick Clark. Kansas The incumbent Republican James B. Pearson was re-elected. Kentucky The incumbent Republican John Sherman Cooper retired, and was succeeded by Democrat Walter Dee Huddleston. Louisiana In the midst of his campaign for a seventh term, Allen J. Ellender, the President Pro Tempore and chairman of the Appropriations Committee, suffered a fatal heart attack on July 27, 23 days prior to the Democratic primary. Ellender, first elected in 1936 as the permanent successor to the assassinated Huey P. Long, was slated to face former state senator and 1971 gubernatorial candidate J. Bennett Johnston and minor candidate Frank Allen in the primary. Governor Edwin Washington Edwards, who defeated Johnston by less than 4,500 votes in the 1971 Democratic runoff, nominated his wife, Elaine Edwards, to fill the remainder of Ellender's term, with the agreement Mrs. Edwards would resign immediately following the general election to allow the winner to gain seniority over other new senators. On the same day as Edwards' inauguration on Capitol Hill, the Louisiana Democratic Party rejected a challenge by former Governor John McKeithen to reopen qualifying following Ellender's death, ordering the primary to be held August 19 as scheduled, ignoring an opinion to the contrary by Louisiana Attorney General William J. Guste Jr. Ellender's name was not removed from the ballot and he received 10 percent of the primary vote as a tribute. McKeithen, whose eight-year gubernatorial tenure ended May 9, 1972, ran as an independent with support of the Ellender family, incensed by Johnston's primary challenge. Johnston easily won the Democratic primary, nullifying the need for a September 30 runoff. In the general election, the Shreveport native trounced McKeithen by 32 points to win the first of his four terms. He was sworn in November 13, 1972. Maine Incumbent Republican Margaret Chase Smith ran for re-election to a fifth term, but was defeated by Democrat William Hathaway, member of the U.S. House of Representatives from . Massachusetts Incumbent Republican Edward Brooke, first elected in 1966 as the first African-American elected to the Senate by popular vote, defeated his challengers, among them: John J. Droney, the Middlesex County District Attorney. Michigan The incumbent Republican Robert P. Griffin was re-elected. Minnesota Incumbent Democrat Walter Mondale, who