Marriage equality advocates passed out donuts to those waiting in line to enter SCOTUS.
Thousands came out to protest.
The scene in front of the Supreme Court.
Gay marriage supporters show off their funny signs in front of the court.
next slide will load in 15 secondsSkip AdSkip AdThis was one of our favorites.
Gabriela Fore, 6, of Upper Darby, Pa., accompanied by her moms, joins the fray in front of the Supreme Court.
Photojournalist Jenna Pope tweeted this photo from outside.
Fred Phelps Jr., a member of the Westboro Baptist Church, holds a sign in front of the Supreme Court.
Gay marriage supporters PDA in front of the Westboro Baptist protesters.
next slide will load in 15 secondsSkip AdSkip AdAnd not all protesters agreed with the religious arguments against gay marriage.
Kaylie Hanson, press secretary for Sen. Chris Murphy (D-Conn.), tweeted this photo of kids protesting.
Alan Eckert (left) of Albany, Calif., joins a fellow DOMA opponent, whose sign mocks the "slippery slope" argument against gay marriage.
A gay marriage opponent dressed in Soviet military garb protests in front of the Supreme Court.
Diana Iwanski of Clermont, Florida, holds up her sign to show support for gay marriage.
next slide will load in 15 secondsSkip AdSkip AdRebecca Winchell of Columbia, Md. sings as gay marriage supporters look on.
Mean Girls take on gay marriage.
Via Colby Itkowitz of the Allentown Morning Call
The Huffington Post's Jennifer Bendery found these anti-circumcision protesters in the crowd — a strange departure from the issue of the day.
Tampa Bay Times' Alex Leary tweeted this photo of plaintiff Edith Windsor addressing the media. She said her team "feels it won the argument."
Now check out what went down inside the Supreme Court...