More than state legislative seats 6,000 seats are up for election this year. Republicans and Democrats are spending tens of millions in a battle to shift the balance of power in these chambers.
"It's this endless feedback loop where the state legislature plays a hand in drawing its own lines, runs for office in those lines, and then can stay in office," says Sam Wang, professor and director of the Gerrymandering Project at Princeton University.
State legislatures have grown in influence and power over the last two decades, leading to a patchwork of laws around the country on reproductive rights, voter registration, health care, education and guns.
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