Gay Marriage Argued Before US Supreme Court

Plaintiff Edith Windsor looks to supporters in front of the Supreme Court in Washington, March 27, 2013.

A supporter of traditional marriage rallies in front of the Supreme Court in Washington, March 27, 2013.

Demonstrators chant outside the Supreme Court in Washington as the court heard arguments on California's Proposition 8, March 26, 2013.

A demonstrator holds a bible while marching outside the Supreme Court in Washington as the court heard arguments on California's Proposition 8, March 26, 2013.

Plaintiff attorneys Theodore Olson, right, and David Boies, meet with the media outside the Supreme Court in Washington after the court heard arguments on California's Proposition 8, March 26, 2013.

Anti-Proposition 8 protesters are shadowed by a rainbow banner in front of the U.S. Supreme Court in Washington, March 26, 2013.

Demonstrators stand outside the Supreme Court in Washington as the court hears arguments on California's Proposition 8, March 26, 2013.