Fred Harris, a self-described populist Democrat from Oklahoma who served eight years in the U.S. Senate before an unsuccessful campaign for president in 1976, has died. He was 94.

Harris’ wife, Margaret Elliston, confirmed his death to the Associated Press in a text message on Saturday, writing: "Fred Harris passed peacefully early this morning of natural causes. He was 94. He was a wonderful and beloved man. His memory is a blessing."

Harris, who was living in New Mexico, died in a hospital in Albuquerque, Elliston told The New York Times.

Harris first served for eight years in the Oklahoma State Senate after winning election in 1956. He then launched his career in national politics in 1964 when he won a Senate race to fill the vacancy left by Sen. Robert S. Kerr, who died in January 1963.

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"I’ve always called myself a populist or progressive," Harris said in a 1998 interview. "I’m against concentrated power. I don’t like the power of money in politics. I think we ought to have programs for the middle class and working class."

As a U.S. senator, Harris was a member of the National Advisory Commission on Civil Disorders, the so-called Kerner Commission, appointed by then-President Lyndon Johnson to investigate the urban riots of the late 1960s.

The commission released its report in 1968, declaring, "our nation is moving toward two societies, one black, one white — separate and unequal."

Thirty years later, Harris co-wrote a report that concluded the commission’s "prophecy has come to pass," stating that "the rich are getting richer, the poor are getting poorer and minorities are suffering disproportionately."

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In 1976, Harris ran a failed bid to earn the Democratic presidential nomination, bowing out of the race after poor showings in early contests. The more moderate Jimmy Carter went on to win the presidency.

Harris moved to New Mexico that year and became a political science professor at the University of New Mexico. He wrote and edited more than a dozen books, mostly on politics and Congress. In 1999, he broadened his writings with a mystery set in Depression-era Oklahoma.

Harris was born Nov. 13, 1930, in a two-room farmhouse near Walters, in southwestern Oklahoma. The home had no electricity, indoor toilet or running water. He worked on the farm starting at age 5, driving a horse in circles to supply a hay bailer with power – earning 10 cents a day.

He later worked part-time as a janitor and printer’s assistant to help pay for his education at the University of Oklahoma, where he earned a law degree in 1954. He practiced law in Lawton before beginning his career in politics.

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Harris married his high school sweetheart, LaDonna Vita Crawford, in 1949, and had three children, Kathryn, Byron and Laura. After the couple divorced, Harris married Margaret Elliston in 1983. 

The Associated Press contributed to this report.