The Supreme Court is set to take a serious look at partisan gerrymandering with a case that could jeopardize voter maps across the country and help Democrats regain control of Congress.

The case, which will be heard next term, will be closely followed by lawmakers, since the outcome could define how far state legislatures can go in drawing up district lines for partisan gain.

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But Nate Persily, a professor at Stanford Law School, said he’d be shocked if the resulting legal challenges led to maps being redrawn before the 2018 midterm elections.