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FILE - Former Oklahoma Sen. Fred Harris stands outside his Corrales, N.M., home, Friday, July 23, 2004. (AP Photo/Jake Schoellkopf, File)

FILE - Former Oklahoma Sen. Fred Harris stands outside his Corrales, N.M., home, Friday, July 23, 2004. (AP Photo/Jake Schoellkopf, File)

FILE - Sen. Fred R. Harris (D-Okla.), holds a copy of the report of the National Advisory Commission on Civil Disorders as he and two other members of the commission discuss the study on the television-radio program "Issues and Answers," in Washington, March 3, 1968. (AP Photo/Bob Daugherty, File)

FILE - Sen. Fred R. Harris (D-Okla.), holds a copy of the report of the National Advisory Commission on Civil Disorders as he and two other members of the commission discuss the study on the television-radio program "Issues and Answers," in Washington, March 3, 1968. (AP Photo/Bob Daugherty, File)

FILE - Sen. Fred Harris of Oklahoma at a Democratic party commission meeting on March 1, 1969, in Washington. (AP Photo, File)

FILE - Sen. Fred Harris of Oklahoma at a Democratic party commission meeting on March 1, 1969, in Washington. (AP Photo, File)

FILE - Former Democratic National Committee Chairman Fred Harris poses for a photo at a restaurant on May 3, 2016, in Corrales, N.M., the town where he lives. (AP Photo/Morgan Lee, File)

FILE - Former Democratic National Committee Chairman Fred Harris poses for a photo at a restaurant on May 3, 2016, in Corrales, N.M., the town where he lives. (AP Photo/Morgan Lee, File)