Warner joins a slew of politicians from both sides of the aisle who have come out in favor of same-sex marriage ahead of oral arguments at the Supreme Court this week in two cases about whether same-sex couples have the right to marry.
Sen. Claire McCaskill (D-Mo.), who hails from a traditionally red state, announced her support earlier in the day, and former Secretary of State Hillary Clinton made her statement of support in a video last week.
On the GOP side, Sen. Rob Portman (R-Ohio), once viewed as a potential vice presidential candidate to Mitt Romney, publicly endorsed gay marriage this month after learning two years ago his son was gay. Last month, other prominent Republicans signed a legal brief arguing that same-sex couples have a constitutional right to marry.
In his statement, Warner touted his past efforts on behalf of gay rights.
“I was proud to be the first Virginia governor to extend anti-discrimination protections to LGBT state workers,” he said. “In 2010, I supported an end to the military’s ‘don’t ask, don’t tell’ policy, and earlier this month I signed an amicus brief urging the repeal of DOMA. I believe we should continue working to expand equal rights and opportunities for all Americans.”