The Supreme Court’s term is ending this week with rulings on several blockbuster cases. On Tuesday, voting rights advocates welcomed a decision in a major election law case that preserved checks and balances in elections. In a 6-3 decision, the justices dismissed the so-called independent state legislature theory that state lawmakers have nearly unlimited power to make rules for federal elections. This ruling will “empower state courts around the country to block gerrymanders, to police the legislatures and to keep legislators from trying to entrench themselves or advance their party with these egregious maps,” says Michael Waldman, president and CEO of the Brennan Center for Justice. Now the country awaits the Supreme Court’s decisions on affirmative action and student debt, which Waldman calls “hugely consequential.” Waldman’s new book is The Supermajority: How the Supreme Court Divided America.