Nate Cohn in NYT: 

Republicans have been redrawing congressional districts this year at President Trump’s behest, but so far it hasn’t seemed to be enough to deny Democrats a reasonable path to control of the House of Representatives.

That might change if the Supreme Court strikes down Section 2 of the 1965 Voting Rights Act in Louisiana v. Callais, a case the court heard Wednesday.

Without Section 2, which has been interpreted to require the creation of majority-minority districts, Republicans could eliminate upward of a dozen Democratic-held districts across the South.