Hillary Clinton speaks at a small business forum in Norwalk, Iowa. (Justin Sullivan, Getty Images)

Hillary Clinton speaks at a small business forum in Norwalk, Iowa. (Justin Sullivan, Getty Images)

Hillary Clinton wants the Supreme Court to rule in favor of a constitutional right to gay marriage.

The Democratic presidential contender is weighing in on the subject ahead of the Supreme Court’s April 28 arguments in a cases regarding same-sex marriage bans in Kentucky, Michigan, Ohio and Tennessee.

“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,” Clinton spokeswoman Adrienne Elrod said Wednesday.

Clinton’s position on gay marriage has evolved over the years — as it has for President Obama — and she first endorsed the right of same-sex couples to marry in March 2013. Previously, she had supported civil unions for gay couples.

“I support it personally and as a matter of policy and law, embedded in a broader effort to advance equality and opportunity for LGBT Americans and all Americans,” Clinton said in a 2013 video released by the Human Rights Campaign.

She last discussed the issue publicly during her book tour last year for Hard Choices, in which Terry Gross of NPR tried to get Clinton to expand on how her views had evolved. In that NPR interview, which was sometimes testy, Clinton told Gross that “marriage has always been a matter left to the states and in many of the conversations I and my colleagues and supporters had, I fully endorse the efforts by activists to work state-by-state.”

Same-sex marriage is now legal in 37 states and the District of Columbia.