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 1964 United States Senate elections were held on November 3. The 33 seats of Class 1 were contested in regular elections. Special elections were also held to fill vacancies. They coincided with the election of President Lyndon B. Johnson by an overwhelming majority, to a full term. His Democratic Party picked up a net two seats from the Republicans. As of 2023, this was the last time either party has had a two-thirds majority in the Senate, which allowed the Senate Democrats to override a veto, propose constitutional amendments, or convict and expel certain officials without any votes from Senate Republicans. However, internal divisions would have prevented the Democrats from having done so. The Senate election cycle coincided with Democratic gains in the House in the same year.
John James "Whispering Willie" Williams was an American businessman and politician from Millsboro, Delaware. He was a member of the Republican Party and served four terms as U.S. senator from Delaware from 1947 to 1970.
The 1920 United States Senate elections were elections for the United States Senate that coincided with the presidential election of Warren G. Harding. The 32 seats of Class 3 were contested in regular elections, and special elections were held to fill vacancies. Democrat Woodrow Wilson's unpopularity allowed Republicans to win races across the country, winning ten seats from the Democrats and providing them with an overwhelming 59-to-37 majority. The Republican landslide was so vast that Democrats lost over half of the seats that were contested this year and failed to win a single race outside the South.
James Asheton Bayard Jr. was an American lawyer and politician from Delaware. He was a member of the Democratic Party and served as U.S. Senator from Delaware.
Lewis Heisler Ball was an American physician and politician from Mill Creek Hundred, New Castle County, Delaware. He was a member of the Republican Party and served as U.S. Representative from Delaware and two terms as U.S. Senator from Delaware. He was known by his middle name.
Josiah Oliver Wolcott was an American lawyer, politician and judge, from Dover, in Kent County, Delaware. He was a member of the Democratic Party, who served as Attorney General of Delaware, U.S. Senator from Delaware, and Chancellor of Delaware.
Thomas Coleman du Pont was an American engineer and politician, from Greenville, Delaware. He was President of E. I. du Pont de Nemours and Company, and a member of the Republican Party who served parts of two terms as United States Senator from Delaware.
Thomas Francis Bayard Jr. was an American lawyer and politician from Wilmington, Delaware. He was a Democratic U.S. Senator from Delaware in the 1920s.
John Gillis Townsend Jr. was an American businessman and politician from Selbyville in Sussex County, Delaware. He was a member of the Republican Party who served one term as Governor and two terms as U.S. Senator from Delaware.
James Miller Tunnell was an American lawyer and politician from Georgetown, in Sussex County, Delaware. He was a member of the Democratic Party, and served as U.S. Senator from Delaware.
William duHamel Denney was an American businessman and politician from Dover, in Kent County, Delaware. He was a veteran of World War I and member of the Republican Party, who served in the Delaware General Assembly and as Governor of Delaware.
Daniel Oren Hastings was an American lawyer and politician from Wilmington, New Castle County, Delaware. He was a member of the Republican Party who served two terms as a U.S. Senator from Delaware.
Alexis Irénée du Pont Bayard was an American lawyer and politician from Rockland, near Greenville, in New Castle County, Delaware. A member of the Democratic Party, he served as the 13th Lieutenant Governor of Delaware from 1949 to 1953 and ran unsuccessfully for the United States Senate in 1952.
The 1910–11 United States Senate election were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were primarily chosen by state legislatures. Senators were elected over a wide range of time throughout 1910 and 1911, and a seat may have been filled months late or remained vacant due to legislative deadlock. However, some states had already begun direct elections during this time. Oregon pioneered direct election and experimented with different measures over several years until it succeeded in 1907. Soon after, Nebraska followed suit and laid the foundation for other states to adopt measures reflecting the people's will. By 1912, as many as 29 states elected senators either as nominees of their party's primary or in conjunction with a general election.
The Republican State Committee of Delaware is the affiliate of the United States Republican Party in Delaware. It has five regional offices in Kent County, Western New Castle County, Central New Castle County, Northern New Castle County, and Sussex County.
The 1952 United States Senate election in Delaware took place on November 4, 1952. Incumbent Republican U.S. Senator John J. Williams was re-elected to a second term in office over Democratic Lieutenant Governor Alexis I. du Pont Bayard, the son of former Senator Thomas F. Bayard, Jr. and descendant of two of Delaware's most powerful families, the du Ponts and the Bayards.
The 1916 United States Senate election in Delaware took place on November 7, 1916.
The 1928 United States Senate election in Delaware took place on November 6, 1928. Incumbent Republican U.S. Senator Thomas F. Bayard Jr. ran for a third term in office, but was defeated by former Republican Governor John G. Townsend Jr. in a landslide.
