Both Democrats and Republicans have gerrymandered in the past to their advantage, but Republicans took it to a new level in 2011. In an amicus brief to the Pennsylvania Supreme Court, political science professors Keith Gaddie and Bernard Grofman wrote that there was as much as three times more partisan bias in congressional maps this decade than in ones drawn in 2000. Nicholas Stephanopoulos, a law professor at the University of Chicago helping challenge a Wisconsin map, said a “dramatic number” of the worst gerrymanders of the last half-century have occurred since 2010.

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