Results of pivot counties in 2018 state legislative elections
In yesterday’s Daily Brew, I discussed how Pivot Counties - those that voted for Barack Obama (D) in both 2008 and 2012 and Donald Trump (R) in 2016 - voted in the 2018 U.S. House elections. Today, I’ll look at how those counties voted in state legislative elections.

Last November, 87 of the nation's 99 state legislative chambers held regularly-scheduled elections for 6,073 seats. Of those, 453 state house districts and 138 state senate districts intersected with pivot counties. This includes districts that intersected with only small portions of a county as well as districts that overlapped with multiple counties. These 591 state legislative districts accounted for approximately 10 percent of all state legislative districts up for election in 2018.
Heading into the election, the partisan breakdown of those 591 districts was 340 Republican, 232 Democrat, 18 districts were split between the parties, and one was held by an independent. After the election, the partisan breakdown of these districts was 325 Republican, 251 Democrat, 12 districts were split between the parties, and three were held by independents.
Fourteen state senate districts that intersect with pivot counties switched partisan control in the 2018 elections, resulting in a net change of six seats in favor of Democrats. Among those, 10 districts flipped from Republican to Democrat, while four flipped from Democrat to Republican.
Among the state house districts that intersect with Pivot Counties, 57 switched partisan control in the 2018 elections, resulting in a net change of 13 seats in favor of Democrats. The most common changes were:
- Republican to Democrat: 21 districts
- Democrat to Republican: 16 districts
- Split districts to all-Democrats: 10 districts
- The other changes in these districts generally resulted from changes in the partisan composition of multi-member districts in New Hampshire, South Dakota, and Washington.
Compared to all districts, fewer state legislative districts that intersect with a pivot county changed party in the 2018 elections. In total, Democrats won a net total of 19 state legislative seats in those districts, which represents 3.2 percent of the total they controlled before the elections. Nationally, the party gained 308 seats or 9.7 percent of the number of seats held going into the elections. Meanwhile, Republicans lost control of 3.3 percent of the districts they controlled that intersected with pivot counties, while in total they lost 7.2 percent of their seats held nationwide. Those numbers are not the exact inverse of each other due to seats held by independents and members of third parties.
Across the country, Democrats gained control of six state legislative chambers from Republicans in 2018, while losing one chamber, the Alaska House of Representatives, to a power-sharing agreement.
The current partisan breakdown of state legislative chambers is 61 Republican, 37 Democrat, and the Alaska House of Representatives is under split control.
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