The U.S. Supreme Court has set its eagerly awaited argument date for potentially landmark same-sex marriage cases: April 28.

Four cases are consolidated for 2 1/2 arguments beginning that Tuesday morning. Gay and lesbian couples challenge marriage bans in Michigan (DeBoer v. Snyder); Ohio (Obergefell v. Hodges); Kentucky (Bourke v. Beshear), and Tennessee (Tanco v. Haslam).