Sen. Mark Warner, D-Va., announced on his Facebook page that after some "evolving," he now officially supports gay marriage.

"I support marriage equality because it is the fair and right thing to do," he wrote. "Like many Virginians and Americans, my views on gay marriage have evolved, and this is the inevitable extension of my efforts to promote equality and opportunity for everyone."

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Chris Geidner from BuzzFeed points out that though Warner signed on to a March 1 brief urging the Supreme Court to strike down DOMA, his office would not explicitly express support for same-sex marriage at the time.

On Sunday, Sen. Claire McCaskill, D-Mo., also expressed her support for gay marriage on her Tumblr page: