Since Colorado became a U.S. state in 1876, it has sent congressional delegations to the United States Senate and United States House of Representatives, beginning with the 44th United States Congress. Prior to statehood, the Colorado Territory sent non-voting delegates to the House of Representatives from 1861 to 1876. Each state elects two senators to serve for six years, and members of the House to two-year terms. Each state elects two senators to serve for six years in general elections, with their re-election staggered. Prior to the ratification of the Seventeenth Amendment in 1913, senators were elected by the Colorado General Assembly. Each state elects a varying number of, but at least one, member of the House, depending on population, to two-year terms. Colorado has sent eight members to the House in each congressional delegation since the 2020 United States Census.
The 1932 United States Senate elections coincided with Democrat Franklin D. Roosevelt's landslide victory over incumbent Herbert Hoover in the presidential election. The 32 seats of Class 3 were contested in regular elections, and special elections were held to fill vacancies.
Alva Blanchard Adams Sr. was an American lawyer and Democratic politician from Pueblo, Colorado. He served nine years as a United States senator from Colorado, serving by appointment from 1923 to 1924, then serving again from 1933 until his death in 1941. He was the first U.S. senator from Colorado who was born in Colorado. He is the namesake of the Alva B. Adams Tunnel under Rocky Mountain National Park.
Eugene Donald Millikin was a United States senator from Colorado who served as Senate Republican Conference Chairperson from 1947 to 1956.
The 1942 South Carolina United States Senate election was held on November 3, 1942 to select the U.S. Senator from the state of South Carolina. Incumbent Senator Burnet R. Maybank defeated Eugene S. Blease in the Democratic primary and was unopposed in the general election to win a six-year term.
The 2014 Colorado gubernatorial election was held on November 4, 2014, to elect the governor and lieutenant governor of Colorado, concurrently with the election to Colorado's Class II U.S. Senate seat, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections.
The 2016 United States Senate election in Colorado was held November 8, 2016, to elect a member of the United States Senate to represent the State of Colorado, concurrently with the 2016 U.S. presidential election, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections.
John Adams was an American businessman, Democratic politician, and Wisconsin pioneer. He served three years each in the Wisconsin Senate and State Assembly, representing western Dane County. Adams founded the unincorporated settlement Adamsville, Wisconsin, now a ghost town.
The 1938 United States Senate election in Colorado took place on November 8, 1938. Incumbent Democratic Senator Alva B. Adams ran for re-election to a second term. Adams faced Denver attorney Archibald A. Lee, the Republican nominee, in the general election. Despite the nationwide Republican landslide, including Republicans' landslide victory in the gubernatorial election that year, Adams's popularity translated into an easy re-election campaign. Adams ended up defeating Lee with 58% of the vote. However, Adams did not end up fully serving his second term; he died on December 1, 1941.
The 1948 United States Senate election in Colorado took place on November 2, 1948. Incumbent Democratic Senator Edwin C. Johnson was re-elected to third term in a landslide over Republican Will Nicholson, a businessman and Air Force veteran, winning every county in the state.
The 1956 United States Senate special election in Colorado took place on November 6, 1956. Incumbent Republican Senator Eugene Millikin declined to seek re-election to a third term and a competitive election ensued. Former Congressman John A. Carroll, in his third consecutive bid for the Senate, narrowly defeated former U.S. Secretary of Agriculture Charles F. Brannan in the Democratic primary and advanced to the general election, where he faced Governor Dan Thornton, the Republican nominee. Despite Democratic presidential nominee Adlai Stevenson's poor performance in Colorado, state-level Democrats fared much better. Carroll ended up narrowly defeating Thornton, winning his only term in the U.S. Senate.
The 1950 United States Senate election in Colorado took place on November 7, 1950. Incumbent Republican Senator Eugene Millikin ran for re-election to his second full term. He faced a strong challenge from Congressman John A. Carroll, the Democratic nominee, in the general election. Carroll ultimately lost, but despite facing considerable headwinds nationwide, held Millikin to the narrowest victory of his career.
The 1944 United States Senate special election in Colorado took place on November 7, 1944. Incumbent Republican senator Eugene Millikin, who was first appointed to fill Alva B. Adams's seat in 1941 and re-elected at the ensuing special election in 1942, ran for re-election to his first full term. In the general election, he faced wealthy Denver attorney Barney L. Whatley. Millikin benefited from the strong Republican performance in Colorado—Thomas E. Dewey and Governor John C. Vivian both won their respective elections by decisive margins—and cruised to a landslide victory over Whatley.
The 1914 United States Senate election in Colorado took place on November 3, 1914. It was the first direct U.S. Senate election in Colorado following the ratification of the Seventeenth Amendment. Incumbent U.S. Senator Charles S. Thomas, a Democrat, who was first elected by the state legislature to fill a vacancy in 1913, ran for re-election to a full term.
The 1920 United States Senate election in Colorado took place on November 2, 1920. Incumbent Democratic Senator Charles S. Thomas initially declined to run for re-election, and State Supreme Court Justice Tully Scott won the Democratic nomination to succeed him, facing off against former Leadville Mayor Samuel D. Nicholson, the Republican nominee. However, in October 1920, Thomas announced that he would run for re-election as the nominee of the National Party. However, Thomas's decision did not ultimately affect the outcome of the election. Aided by Republican presidential nominee Warren G. Harding's strong performance in the state, as well as Republican Governor Oliver Henry Shoup's landslide re-election, Nicholson defeated Tully and Thomas in a landslide. Out of four candidates, Thomas placed fourth, winning just 3% of the vote and finishing behind Farmer–Labor nominee G. F. Stevens.
The 1924 United States Senate special election in Colorado took place on November 4, 1924, to fill the remainder of the term for which Samuel D. Nicholson was elected in 1920. Nicholson died in office on March 24, 1923, and Democratic Governor William Ellery Sweet appointed Alva B. Adams, a prominent Pueblo attorney, to fill the vacancy. Adams, however, declined to be a candidate in the special election, instead challenging incumbent Republican Senator Lawrence C. Phipps in the regular election the same year.
The 1930 United States Senate election in Colorado took place on November 4, 1930. Republican Senator Lawrence C. Phipps declined to run for re-election, resulting in an open race to replace him. Edward P. Costigan, one of the founding members of the Progressive Party in Colorado and a former member of the United States Tariff Commission, won the Democratic nomination and faced attorney George H. Shaw, the Republican nominee, in the general election. Aided by the nationwide Democratic landslide, Costigan handily defeated Shaw, becoming the first Democrat elected to the Senate from Colorado since 1914.
The 1938 Colorado gubernatorial election was held on November 8, 1938. Republican nominee Ralph Lawrence Carr defeated Democratic incumbent Teller Ammons with 59.50% of the vote.
The 1904 Colorado gubernatorial election was held on November 8, 1904.
The 1932 United States Senate elections in Colorado took place on November 8, 1932. Incumbent Republican Senator Charles W. Waterman announced that he would not seek re-election to a second term. Attorney Karl C. Schuyler won the Republican nomination to succeed Waterman and faced former Senator Alva B. Adams, the Democratic nominee, in the general election.
