Trifecta control changed in 12 states in 2010 where state legislatures were responsible for redistricting
Eleven states are holding gubernatorial elections in 2020, and 44 are holding state legislative elections. In a majority of these states, the officials elected in 2020 will play a part in redrawing legislative maps governing elections for the subsequent 10 years.
The process by which legislative district boundaries are drawn is called redistricting. Every 10 years, the U.S. Census Bureau delivers detailed population datasets to the states. Redistricting authorities in the states use these datasets to redraw congressional, state legislative, and even local district maps.
In 34 states holding state legislative elections in 2020, the legislatures themselves will play a significant role in that state’s 2020 redistricting. In eight of next year's gubernatorial elections, the winner will have veto authority over the state legislative or congressional district plans approved by legislatures.
Redistricting authorities in the United States
The 2010 election and redistricting cycle illustrate how elections can affect the redistricting process.
Trifecta control—where one party controls the governorship and both chambers of a state's legislature—changed as a result of the 2010 elections in 12 states where legislatures were responsible for redistricting. Prior to these elections, seven of the 12 were Democratic trifectas and the rest had divided governments.
- Six states changed from a Democratic trifecta to divided government—Colorado, Iowa, New Hampshire, North Carolina, Oregon, Wisconsin.
- Five states changed from divided government to a Republican trifecta—Alabama, Indiana, Michigan, Ohio, Pennsylvania.
- One state—Maine—changed from a Democratic to Republican trifecta.
Of the 12 states which saw trifecta control change in 2010, three—Alabama, Indiana, and Ohio—are currently Republican trifectas. Three states have become Democratic trifectas—Colorado, Oregon, and Maine. The rest are divided governments.
Our briefing yesterday discussed which states have changed their redistricting processes since the 2010 cycle, recent federal and state court decisions regarding partisan gerrymandering, and the upcoming 2020 Census. If you weren’t able to attend, click here to view the recording.
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