The U.S. Supreme Court on Monday agreed to decide whether electoral maps drawn deliberately to favor a particular political party are acceptable under the Constitution in a case that could have huge consequences for American elections in the future.
The justices will take up Wisconsin's appeal of a lower court ruling last November that state Republican lawmakers violated the Constitution when they created state legislative districts with the partisan aim of hobbling Democrats in legislative races.
The case will be one of the biggest heard by the Supreme Court during its term that begins in October.
The lower court ruled that the Republican-led legislature's redrawing of state legislative districts in 2011 amounted to "an unconstitutional partisan gerrymander," a term meaning manipulating electoral boundaries for an unfair political advantage.
A panel of three federal judges in Madison ruled 2-1 that the way the Republicans redrew the districts violated the U.S. Constitution's guarantees of equal protection under the law and free speech by undercutting the ability of Democratic voters to turn their votes into seats in Wisconsin's legislature.
The Supreme Court has been willing to invalidate state electoral maps on the grounds of racial discrimination, as it did on May 22 when it found that Republican legislators in North Carolina had drawn two electoral districts to diminish the statewide political clout of black voters.
But the justices have not thrown out state electoral maps drawn simply to give one party an advantage over another.
A Supreme Court ruling faulting the Wisconsin redistricting plan could have far-reaching consequences for the redrawing of electoral districts due after the 2020 U.S. census. State and federal legislative district boundaries are reconfigured every decade after the census so that each one holds about same number of people.
The case in the short term could affect congressional maps in about half a dozen states and legislative maps in about 10 states, and then have major implications for the next round of redistricting after the 2020 census, according to the Brennan Center for Justice at the New York University School of Law.