 | |||||||||||||||||
| |||||||||||||||||
| |||||||||||||||||
 County results Armstrong: 50–60% 60–70% 70–80% Haskell: 50–60% 60–70% 70–80% | |||||||||||||||||
| |||||||||||||||||
| Elections in Colorado |
|---|
 |
The 1978 United States Senate election in Colorado took place on November 7, 1978. Incumbent Democratic Senator Floyd Haskell ran for re-election to a second term, but was soundly defeated by Republican U.S. Representative William L. Armstrong.
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | William L. Armstrong | 109,021 | 73.45% | |
| Republican | Jack Swigert | 39,415 | 26.55% | |
| Total votes | 148,436 | 100.00% | ||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Republican | William L. Armstrong | 480,801 | 58.69% |  10.52 | |
| Democratic | Floyd Haskell (incumbent) | 330,148 | 40.30% |  9.11 | |
| Independent | Veeder V. Dorn | 5,789 | 0.71% | N/A | |
| Prohibition | John Shue | 2,518 | 0.31% | N/A | |
| Total votes | 819,256 | 100.00% | |||
The 1984 United States Senate elections were held on November 6, with the 33 seats of Class 2 contested in regular elections. They coincided with the landslide re-election of President Ronald Reagan in the presidential election. In spite of the lopsided presidential race, Reagan's Republican Party suffered a net loss of two Senate seats to the Democrats, although it retained control of the Senate with a reduced 53–47 majority. Democrats defeated incumbents in Illinois and Iowa, and won an open seat in Tennessee, while Republicans defeated an incumbent in Kentucky.
The 1978 United States Senate elections were held on November 7, in the middle of Democratic President Jimmy Carter's term. The 33 seats of Class 2 were contested in regular elections. Special elections were also held to fill vacancies.
The 1972 United States Senate elections were held on November 7, with the 33 seats of Class 2 contested in regular elections. They coincided with the landslide re-election of Republican President Richard Nixon. Despite Nixon's landslide victory, Democrats increased their majority by two seats. The Democrats picked up open seats in Kentucky and South Dakota, and defeated four incumbent senators: Gordon Allott of Colorado, J. Caleb Boggs of Delaware, Jack Miller of Iowa, and Margaret Chase Smith of Maine. The Republicans picked up open seats in New Mexico, North Carolina, and Oklahoma, and defeated one incumbent, William B. Spong Jr. of Virginia.
The 1916 United States Senate elections were elections that coincided with the re-election of President Woodrow Wilson. This was the first election since the enactment of the Seventeenth Amendment that all 32 Class 1 Senators were selected by direct or popular elections instead of state legislatures. Republicans gained a net of two seats from the Democrats, and then a furthered seat through mid-term vacancies thereby reducing Democrats to a 53-43 majority.
The 2010 United States Senate election in Colorado took place on November 2, 2010, alongside other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. In December 2008, President-elect Barack Obama nominated incumbent U.S. Senator Ken Salazar as Secretary of the Interior. After Salazar resigned from his seat, Democratic governor Bill Ritter appointed Denver Public Schools Superintendent Michael Bennet to fill the seat.
The 1978 United States Senate election in Maine was held on November 7, 1978. Incumbent Democratic U.S. Senator William Hathaway ran for re-election to a second term, but was defeated by William Cohen, the Republican U.S. Representative from Maine's 2nd congressional district.
The 1978 United States Senate election in Mississippi was held on November 5, 1978. Incumbent Democratic U.S. Senator James Eastland decided to retire.
The 1978 United States Senate election in Michigan was held on November 7, 1978. Incumbent Republican U.S. Senator Robert P. Griffin ran for re-election to a third term, but was defeated by the Democratic candidate, Detroit City Council President Carl Levin.
The 1978 United States Senate election in Texas was held on November 7, 1978. Incumbent Republican U.S. Senator John Tower narrowly won re-election to a fourth term. This is the closest that a Texas Democrat has come to defeating a Republican incumbent U.S. Senator.
The 1978 United States Senate election in Virginia was held on November 7, 1978. Incumbent Republican Senator William L. Scott did not run for re-election to a second term. Republican former Secretary of the Navy John Warner narrowly defeated Democratic Attorney General of Virginia Andrew P. Miller to succeed him. Originally, this election was a match between Republican Richard Obenshain and Miller, then Obenshain died in a plane crash, leaving the party in disarray. Warner was then nominated to run in Obenshain's place, and his victorious election thrust him into a thirty-year career in the United States Senate, which started with this election.
The 1978 United States Senate election in Tennessee took place on November 7, 1978, to select the U.S. Senator from the state of Tennessee. Two-term popular incumbent Republican U.S. Senator, Howard Baker, who had served as United States Senate Minority Leader since 1977, ran for re-election against first-time candidate and Democratic Party activist Jane Eskind. Baker won re-election in the general election.
The 1978 United States Senate election in Arkansas took place on November 7, 1978. Incumbent U.S. Senator John L. McClellan had died the previous December, leaving the seat vacant. Interim appointee Kaneaster Hodges Jr. did not run to the full seat, and was succeeded by Governor of Arkansas David Pryor.
The 1968 United States Senate election in Ohio took place on November 5, 1968. Incumbent Senator Frank Lausche ran for re-election to a third term, but lost the Democratic primary to former U.S. Representative John J. Gilligan. Before losing the primary to the more solidly liberal Gilligan, Lausche had one of the most conservative voting record among Senate Democrats, leaving the Democratic Party very disappointed. In the general election, Gilligan lost to Republican Ohio Attorney General William Saxbe in a close race. Saxbe's victory increased the number of Senate Republicans in the 91st Congress. He would serve 5 years in the Senate before being nominated by President Richard Nixon to be U.S Attorney General, he resigned the seat after being confirmed. Gilligan, who in January 1974 was serving as the Governor of Ohio, named Saxbe's successor.
The 1972 United States Senate election in Arkansas took place on November 7, 1972. Incumbent U.S. Senator John L. McClellan was re-elected to a sixth term in office, defeating U.S. Representative David Pryor in a hotly contested primary. In the general election, McClellan easily defeated Republican physician Wayne Babbitt. This was McClellan's final campaign; he died in his sleep in 1977. Pryor was elected Governor of Arkansas in 1974 and won the race to succeed McClellan in 1978.
The 1972 United States Senate election in Colorado took place on November 7, 1972. Incumbent Republican U.S. Senator Gordon Allott ran for re-election to a fourth term, but was narrowly defeated by Democratic former State Representative Floyd Haskell. This would be the last time until 2008 that a Democrat was elected to the Class 2 Senate seat from Colorado. Colorado was one of fifteen states alongside Alabama, Arkansas, Delaware, Georgia, Iowa, Louisiana, Maine, Minnesota, Mississippi, Montana, New Hampshire, Rhode Island, South Dakota and West Virginia that were won by Republican president Richard Nixon in 1972 that elected Democrats to the United States Senate.
The 1978 United States Senate election in Iowa took place on November 7, 1978. Incumbent Democratic Senator Dick Clark ran for re-election to a second term but was defeated by Republican former Lieutenant Governor Roger Jepsen. This was the last time until 2014 that a Republican would win Iowa's class 2 Senate seat.
The 1978 United States Senate election in Kansas took place on November 7, 1978. Incumbent Republican Senator James B. Pearson did not run for re-election to a third full term.
The 1978 United States Senate election in Kentucky took place on November 7, 1978. Incumbent Senator Walter Dee Huddleston won reelection to a second term. As of 2023, this was the last time Democrats and/or anyone other than Mitch McConnell won the Class 2 Senate seat in Kentucky.
The 1978 United States Senate election in Oregon took place on November 7, 1978. Incumbent Republican Senator Mark Hatfield was re-elected to a third term in office, defeating Democrat Vernon Cook.
The 1978 United States Senate election in South Dakota was held on November 7, 1978. Incumbent Democratic U.S. Senator James Abourezk did not run for re-election to a second term, but was succeeded by his political rival, Republican U.S. Representative Larry Pressler.
