Redistricting in California is the process of redrawing the California State Senate, California Assembly, and federal congressional maps. It is usually done after each decennial census and subsequent reapportionment. California is one of eight states with an independent commission. It was created by voters in 2008 when they passed a ballot measure to take redistricting power away from the Legislature for state Assembly and Senate districts. In 2010, voters added congressional redistricting to the commission's duties. The commission's makeup is 5 Democrats, 5 Republicans and 4 unaffiliated citizens, chosen from business people, professors, or community leaders.