Credit: Images courtesy of Greg Warrington, UVM
This map shows a shifting kaleidoscope of partisan advantage, for U.S. Congressional voting districts, since 1972. The size of each state is adjusted according to its number of seats in 2012. “The 2003 Texas redistricting is striking,” notes Greg Warrington who created a new mathematical tool, a declination, used to measure the gerrymandering shown here. States without at least one seat won by each party are shown in gray.