Pennsylvania Supreme Court flip and redistricting (2015-2018)
November 2015 - February 2018What Happened
Democrats swept all three open seats on the Pennsylvania Supreme Court in 2015, creating a 5-2 majority. In January 2018, the new court ruled the state's congressional map was an unconstitutional partisan gerrymander — under the 2011 Republican-drawn map, GOP candidates had won 13 of 18 seats despite receiving only 49% of the statewide vote. When the legislature failed to agree on a replacement, the court drew its own maps.
Outcome
Democrats gained three congressional seats in the 2018 midterms under the redrawn maps, and the new map was widely considered one of the fairest in the country.
The ruling established that state constitutions could provide independent grounds to challenge partisan gerrymandering — a principle that became even more important after the U.S. Supreme Court ruled in 2019 that federal courts could not hear such claims.
Why It's Relevant Today
Wisconsin's liberal majority has already redrawn state legislative maps and is now considering congressional redistricting cases. Pennsylvania shows the full arc: court flip, map challenge, redrawn districts, changed election outcomes.
