Political chaos has broken out in Pennsylvania after the state’s high court last week redrew the congressional map for this year’s midterm elections. Behold our future judicial overlords if the U.S. Supreme Court rules that partisan gerrymanders are unconstitutional.

Last month a 5-2 liberal majority of the Pennsylvania Supreme Court struck down, with unvarnished political hubris, the congressional map adopted by the GOP legislature way back in 2011. The districts “clearly, plainly and palpably violate our state Constitution”...