St. Patrick's Day Parade St. Patrick's Day Parade

U.S. Rep. Seth Moulton, D-Mass., (center without hat) marches with members of OutVets, a group of LGBTQ military veterans, during the 2015 St. Patrick's Day parade in Boston. Steven Senne/AP hide caption

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Steven Senne/AP

Artist Gilbert Baker, designer of the Rainbow Flag, is draped with the flag while holding a banner that reads "Boycott Homophobia" before the start of the St. Patrick's Day parade in March in New York. Mark Lennihan/AP hide caption

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Mark Lennihan/AP