Senator Clapp became the third incumbent U.S. Senator to lose their seat joining Democrat James Shields in 1859 and Democrat Charles Towne in 1901.
Kellogg was a former Rochester city attorney (1878-1881), Olmsted County Attorney (1882-1887), member of the Republican National Committee (1904-1912), and president of the American Bar Association (1912-1913).
Eberthart was an attorney and bank director in Mankato, former state Senator (SD 11, 1903-1907), Lieutenant Governor (1907-1909), and Governor (1909-1915).
Lindbergh was a former prosecuting attorney of Morrison County (1891-1893), sitting U.S. Representative (CD 06, 1907-1917), Republican candidate for Governor in 1918, and Farmer-Labor candidate for U.S. Senate in 1923. Lindberg was backed by the Nonpartisan League.