Landmark Ruling Promised as Supreme Court Weighs Gay Marriage

Protesters hold pro-gay rights flags outside the US Supreme Court on April 28, 2015 in Washington, DC.

Photo by Olivier Douliery/Getty Images
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The U.S. Supreme Court began a historic session Tuesday as the justices heard arguments in a case that could legalize same-sex marriage nationwide and give gays constitutional protection they’ve been seeking for decades.

The case tests a court that two years ago laid the legal groundwork for gay-marriage rights while stopping short of a definitive ruling. The number of states where gays can legally wed has since tripled to 36, and advocates want the high court to extend that to the rest of the country.