LGBT activist Edie Windsor said Sunday she is supporting presumptive Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE because of the candidate's commitment to fighting for equality.

"Hillary will fight for the Equality Act, which would protect against discrimination in employment, housing and more," Windsor wrote in an op-ed published Sunday on MSNBC.

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"She’ll end so-called 'conversion therapy' and take on LGBT homelessness and violence. And she’s the only candidate with a plan to move us closer to an AIDS-free generation."

In the op-ed, Windsor detailed her own relationship and experiences fighting for marriage equality. For much of her relationship, she had to hide who she was, she wrote. When her partner, Thea, was diagnosed with progressive multiple sclerosis, the two traveled to Canada where they could marry.

After her partner died, Windsor took her fight to the Supreme Court. On June 26, 2013, the court ruled that as a legally married couple, she and Thea "had the same dignity as any other married couple."

"Our marriage would be recognized as equal," she wrote.

The case ruled that the federal government can't discriminate against same-sex couples regarding federal benefits and protections.

"I remember thinking how proud Thea would have been of me for standing up for our marriage. And I know she would want me to keep fighting today," Windsor wrote.

"That’s why I’m going to do everything I can to make sure Hillary Clinton becomes the next president of the United States."

Windsor said Clinton has the "courage" to confront injustice. The candidate has spoken out against "Don't Ask, Don't Tell" and has championed anti-hate crimes legislation. She has also worked to make it easier for LGBT couples to adopt, Windsor wrote.

"As a candidate for president, she rooted for the Supreme Court to rule in favor of marriage equality and celebrated with us when marriage equality became the law of the land exactly two years after the victory in my case," she wrote.

But Windsor said there is still work to do. As the attack at the Orlando nightclub showed, the LGBT community is "still a prime target to harassment and violence," she said. LGBT Americans are often discriminated against, she said, slamming laws in states such as Mississippi and North Carolina, which "seek to treat LGBT Americans as second-class citizens."

"We need a president who isn’t afraid to take on these challenges and has the persistence to actually solve them," she wrote.

She said she plans to keep fighting to eliminate the stigma and isolation LGBT people often experience.

"This Pride month, let’s commit to making sure every lesbian, gay, bisexual and transgender young person can grow up in a country where they can not only marry the love of their life, but go to school, work, and live free from fear and discrimination," she wrote.

"Hillary is the president who will fight to get us there. Because she knows what I know: Love trumps hate, the United States Constitution endures and justice will ultimately prevail."