"It means a lot to us to have the blessing from the pope."
The first papal visit to the United States raised concerns over the pontiff's safety.
Pope calls for stronger "oversight to ensure that youth are protected."
"You could see he was very, very moved," New York's Cardinal Timothy Dolan said.
Pope Francis urged world leaders to focus their efforts on helping the most vulnerable.
Dorothy Day, a 20th century socialist and workers' rights activist, is mentioned alongside Lincoln, King.
The first speech to Congress by a pope is replete with calls for unity and kindness toward immigrants and refugees.
Celebrities, Religious Leaders Celebrate Pope Francis' Visit With Climate Change Rally on D.C.'s National Mall
Organized by the Follow Francis organization, the rally began as Pope Francis was addressing Congress.
Humanity, he said, must "redirect our steps" to avoid catastrophe.
Pope Francis made history on Thursday when he spoke to a joint meeting of Congress.
Pope Francis continued his tour of Washington, D.C., on Wednesday.
The pope said nothing about free speech or human rights during his visit to Cuba.
Taking advantage of the pontiff's visit, Bernie Sanders and Congressional laborers demand a minimum-wage hike.
The pontiff this week will visit New York City, Philadelphia and Washington.
The pope soars stressing humility, helping poor. Can Trump resist taking a shot?
The 78-year-old Argentine pope had been practicing over the summer, but is still not comfortable speaking in English.