Equality PA sent out a statement thanking the governor for allowing the judgment to stand.
"Words cannot express what this means to the loving couples and families in Pennsylvania who have waited so long to be recognized," said Executive Director Ted Martin.
The American Civil Liberties Union of Pennsylvania, who filed the original lawsuit in July of 2013 asking that same-sex couples marry or already same-sex married couples be recognized in the commonwealth, offered this: "We applaud the governor for letting the constitutional principles of freedom and equality ring throughout Pennsylvania by allowing loving same-sex couples to marry."
On Tuesday afternoon, U.S. District Court Judge John Jones III ruled that Pennsylvania’s 1996 Defense of Marriage Act was unconstitutional.
“We are a better people than what these laws represent, and it is time to discard them into the ash heap of history,” he wrote.
Pennsylvania now becomes the 19th state where gay marriage is allowed.
Thousands of people descended upon Philadelphia's City Hall on Tuesday afternoon celebrating the landmark decision.