O'Mahoney was among twelve nominated at the 1944 Democratic National Convention to serve as Roosevelt 's running mate in the presidential election that year . In 1952 , as Republican Dwight D. Eisenhower won the presidential election in a landslide , O'Mahoney was narrowly defeated for re-election by Governor Frank A. Barrett by a margin of 52 % -48 % . He subsequently returned to the private practice of law in Wyoming . Following the suicide of Senator Lester C. Hunt in June 1954 , O'Mahoney was elected the following November both to serve out Hunt 's term and to a full term . He defeated Congressman William H. Harrison , the great-great-grandson of William Henry Harrison ( 9th President of the United States ) and grandson of Benjamin Harrison ( 23rd President of the United States ) , by a margin of 51 % -48 %
1944 Democratic National Convention
1944 Democratic National Convention
Joseph C. O'Mahoney