After
World War I, Kean worked in investment banking in New Jersey and
New York City, heading a firm known as Kean, Taylor & Company. He was a founder of the Livingston National Bank. Republicans had held the seat from 1914 until 1936, when Democrat
Frank W. Towey, Jr. won it on the coattails of President
Franklin Roosevelt's re-election. The seat was viewed as likely to return Republican, and six Republicans sought the nomination in the September 20 primary. Kean won by a narrow 713 vote margin, 13,923 to 13,210 over Montclair Town Commissioner
Dallas S. Townsend. Kean was endorsed by the "Clean Government" faction of the Essex GOP, while Townsend had the backing of the "Suburban Republican" faction. In the General Election, Kean defeated Towey by 12,118 votes, 48,854 (55%) to 36,736 (41%). Kean was re-elected in 1940 (54%), 1942 (61%), 1944 (51%), 1946 (64%), 1948 (51%), 1950 (53%), 1952 (55%), 1954 (53%), and 1956 (60%). He was not a candidate for re-election to an 11th term in 1958 During his 20 years as a Congressman, Kean was the Ranking Minority Member of the
House Ways and Means Committee and served on the House Banking and Currency Committee. He was considered an expert on Social Security and tax law, and was sometimes referred to as "Mr. Social Security" in
Washington, D.C. Kean voted in favor of the
Civil Rights Act of 1957.
U.S. Senate ambitions Kean considered running for
United States Senate in 1954. By early 1954, New Jersey Republican leaders had decided to withdraw party support for the incumbent senator,
Robert C. Hendrickson. Kean had secured commitments of endorsements from several key GOP leaders, but he declined to announce his own campaign until Hendrickson declared his intentions publicly. Hendrickson waited until the day before the filing deadline to say he was retiring, and Kean did not run.
1958 U.S. Senate campaign U.S. Senator
H. Alexander Smith decided not to seek re-election in 1958, and Kean became a candidate for the open seat in the
United States Senate. He won the Republican primary by 23,894 votes over
Bernard M. Shanley, who had served as Deputy Chief of Staff to President
Dwight Eisenhower. Kean received 152,884 votes (43.00%) to Shanley's 128,990 (36.28%).
Robert J. Morris, who had served as Chief Counsel to the
United States Senate Subcommittee on Internal Security, finished third with 73,658 votes (20.72%). Kean had a difficult time as a party leader. Democrats performed well in the 1959 and 1961 elections. Kean backed Bergen County State Senator
Walter H. Jones, the losing candidate in the 1961 Republican gubernatorial primary. A Kean rival, former U.S. Attorney
William F. Tompkins, challenged Kean for re-election in 1961 after Tompkins' candidate, former U.S. Secretary of Labor,
James P. Mitchell, won the gubernatorial nomination. Kean defeated Tompkins, 409 to 268. Kean stepped down as county chairman in 1962. ==Personal life and death==