Gerrymandering
But the justices stopped short of declaring that the districts violated the Constitution.
He hinted that President Barack Obama might also work on this when he's out of office.
WHAT'S HAPPENING
A Rhode Island city that counts inmates, but doesn't represent them, violates the "one person, one vote" principle.
A more liberal court could decide to police how voting districts are drawn.
It all comes down to the decision of a 23-year-old college student.
A heavily gerrymandered and conservative-leaning district elected a Democrat who campaigned against a "religious freedom restoration" bill.