Split Senate Delegations to Decline Substantially in 2019

Following the 2018 midterm elections, the number of states with a split U.S. Senate delegation will drop from 14 to just 10 in 2019. This marks the fourth consecutive election with a decline. This is also just one above the historically low value* of nine split delegations set in 1955-56.

The chart below, from a Pew Research study, shows the totals by state for the past fifty years, ending before this year's midterms. After Democrat Doug Jones won a 2017 special election in Alabama, 14 states had a split delegation.

The 2018 midterm elections saw five states move off that list, with one added. Democratic incumbents in Florida, Indiana, Missouri and North Dakota were defeated as was the Republican incumbent in Nevada. All five of those states moved to a single-party delegation. Interestingly, these were the only five incumbents to lose re-election. The open seat in Arizona was a Democratic gain; that will now have one Senator from each party. As a result, in 2019, 22 states will have two Republican Senators and 18 states will have two Democratic Senators. 

* Since direct election of U.S. Senators began after the passage of the 17th Amendment in 1913. There were 48 states from 1913 until 1959. Independents are counted separately, even if caucusing with a major party.

comments powered by Disqus

Headlines

Sen. Thom Tillis Will Not Seek Reelection Next Year

He had come under attack from Trump after voting "no" to advance the president's signature legislation

Nebraska Rep. Don Bacon Not Seeking Reelection in 2026

A formal announcement will come Monday; Bacon was seen as among the more endangered Republicans next year

Overview and Live Results: New York City Mayoral Primary

Several other city offices are on the ballot

Live Results: Buffalo Mayoral Primary and Legislative Special Elections

Buffalo's acting mayor seeks renomination for a full term; a FL special features the ultimate sibling rivalry

Overview and Live Results: 2025 Virginia Primary

Statewide offices and seats in the House of Delegates are on the ballot this year