Kuchel served in the California State Assembly from 1937 to 1941, in the California State Senate from 1941 to 1945, and as California State Controller from 1946 to 1953. During World War II, Kuchel was a lieutenant commander in the U.S. Naval Reserves. In 1953, Kuchel was appointed to the US Senate by Governor Earl Warren to fill the vacancy created after Republican Senator Richard Nixon was elected Vice President. Kuchel was elected to the remainder of Nixon's term in 1954 and to full terms in 1956 and 1962. As a U.S. Senator, Kuchel had first attempted to steer clear of the factional infighting within the California Republican Party, which took place in the 1950s between Vice President Nixon, US Senate Republican Leader William F. Knowland, a conservative, and Republican Governor Goodwin J. Knight, a liberal. Known as a moderate, Kuchel eventually backed Knowland in his campaign to oust Knight in the Republican primary for governor in 1958. Knight then ran for the United States Senate, but he and Knowland both lost that year. While running for a second full term in 1962, Kuchel pointedly refused to endorse ticket-mate Nixon's candidacy for governor in a heated race against incumbent Democrat Edmund G. "Pat" Brown, Sr. The 1962 election favored incumbents, as Brown beat Nixon by a comfortable margin and Kuchel coasted to victory. To date, Kuchel is the last Senatorial candidate to win all 58 California counties in a single election. However, Kuchel broke with Knowland in 1964 when Knowland asked him to endorse Barry Goldwater for the Republican nomination for president, and Kuchel instead endorsed Nelson Rockefeller, who narrowly lost the California presidential primary to Goldwater. in the Oval Office in 1968. While Kuchel was campaigning against Goldwater, a "vicious document" circulated that purported to be an affidavit signed by a Los Angeles police officer, saying that in 1949, he had arrested Kuchel. The document said that the arrest was for drunkenness while Kuchel had been in the midst of a sex act. Four men were indicted for the libel: Norman H. Krause, a bar owner and ex-Los Angeles policeman, who had actually arrested two people in 1950 who worked in Kuchel's office for drunkenness; Jack D. Clemmons, a Los Angelespolice sergeant until his resignation two weeks before his arrest; John F. Fergus, a public relations man for Eversharp, who was charged with possession of a concealed weapon and given a suspended sentence in 1947; and Francis A. Capell of Zarephath, New Jersey, the publisher of a right-wing newsletter. During the 1966 California gubernatorial primary, Kuchel was urged by moderates to run against conservative actor Ronald Reagan. Citing the hostilities of the growing conservative movement, Kuchel decided not to run. He instead issued a negative statement about the conservatives: "A fanatical neo-fascist political cult of right-wingers in the GOP, driven by a strange mixture of corrosive hatred and sickening fear that is recklessly determined to control our party or destroy it!" Kuchel was narrowly defeated in the Republican primary in 1968 by conservative state Superintendent of Public InstructionMax Rafferty, who went on to lose the general election to Alan Cranston, the former State Controller, a position that had once been held by Kuchel himself. Kuchel returned to practicing law in California until his retirement, in 1981. He was appointed by the Supreme Court to represent the appellee in United States v. 12 200-ft. Reels of Film.
and former White House Chief of Staff and CIA DirectorLeon Panetta began in politics as a legislative assistant to Kuchel. Panetta would cite Kuchel as "a tremendous role model." In August 2010, the Beverly Hills City Council paid tribute to Senator Kuchel on the 100th anniversary of his birth. His widow Betty Kuchel and daughter Karen Kuchel accepted a proclamation from then Councilman and now mayor Dr. William Warren Brien, a grandson of Governor Earl Warren, at the August 17th council meeting.