Appearing at a town hall in Las Vegas on Thursday, Democratic presidential candidate Hillary Rodham Clinton was asked about her support for marriage equality.

At the MSNBC event, a self-identified Bernie Sanders supporter told Clinton that she broke his heart by opposing marriage rights for gay couples a decade ago. Clinton endorsed marriage equality in 2013.

“I do respect you very much,” the audience member said. “In fact, only a decade ago, I was a very big supporter of yourself and your husband.”

“It actually broke my heart when you said marriage was between a man and a woman. How can we trust that this isn't just more political rhetoric?”

“I, like many Americans, have evolved, and I'm glad I have. I'm a 100 percent supporter. I am absolutely adamant about protecting marriage equality,” Clinton responded.