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Here's where the big redistricting court fights stand

Demonstrators outside the U.S. Supreme Court last October during a hearing on a Wisconsin partisan gerrymandering case. Photo: Olivier Douliery / Getty Images

The U.S. Supreme Court and a federal district court on Monday declined requests by Pennsylvania Republicans to block a new congressional map issued by the state's high court last month.

Why it matters: The rulings comes amidst redistricting battles in key states over voting maps drawn after the 2010 census. Both Democrats and Republicans have legally designed maps to gain electoral advantages and capture majorities. These legal challenges could alter how lines are redrawn and set legal precedent for determining when redistricting is infected with political bias and racial discrimination.