This map shows the change in margin between Democrats and Republicans in state legislatures during Barack Obama's (D) presidency between 2009 and 2017. Margin changes were calculated by adding losses and gains for each major party in the state House and Senate.
States colored red saw their legislatures become more Republican during Obama's presidency. States colored blue saw their legislatures become more Democratic. A brighter shade indicates a larger change.
Hover over a state to view additional information about partisan changes.