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Hillary Rodham Clinton’s campaign said on Wednesday that she hopes that the Supreme Court will make same-sex marriage a constitutional right, reflecting a shift in her previous view that it is a decision that should be left to the states.

Adrienne Elrod, a spokeswoman for Hillary for America, said, “Hillary Clinton supports marriage equality and hopes the Supreme Court will come down on the side of same-sex couples being guaranteed that constitutional right.”

The statement reflects a further evolution in Mrs. Clinton’s views on gay marriage. Last year, during an interview with NPR, she said that she supported the expansion of same-sex marriage rights on a state-by-state basis.

“For me, marriage had always been a matter left to the states,” Mrs. Clinton said, going on to explain that such a path of progress was working.

The interview frustrated some in the gay community as Mrs. Clinton was reluctant to say if she always believed that homosexuals should have the right to marry or if her opinion changed since the 1990s when her husband, President Bill Clinton, signed the Defense of Marriage Act.

Mrs. Clinton’s shift comes ahead of a decision by the Supreme Court, probably in June, on whether all 50 states must allow gay and lesbian couples to marry.

Mrs. Clinton’s campaign initially made the statement on Wednesday to BuzzFeed news.