As Twitchy has discovered, not only are people “evolving” in their stand on same-sex marriage — the public’s reactions to each evolution are evolving as well. Sen. Claire McCaskill (D-Mo.) announced her support last night and was lauded as a hero. Today, just before the Supreme Court begins hearing arguments on same-sex marriage, Sen. Mark Warner (D-Va.) took to Facebook to announce that he had evolved as well. (He even used the word “evolved” in his post.)

Sen. Mark Warner takes to Facebook to explain his support for marriage equality. https://t.co/YmqbSkWZfO — Josh Dorner (@JoshDorner) March 25, 2013

I support marriage equality because it is the fair and right thing to do. 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. I was proud to be the first Virginia governor to extend anti-discrimination protections to LGBT state workers. 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.

Warner has the (D) shield following his name, so he’s not likely to be attacked for changing his position as Ohio Republican Sen. Rob Portman was. But how late is too late to been seen as “authentically” supporting gay marriage? Mother Jones reporter Tim Murphy has an idea.

Just remember the deadline for "I've evolved on gay marriage" statements is *tonight* at midnight, EST. — Tim Murphy (@timothypmurphy) March 25, 2013

It's kind of funny to watch all the politicians scrambling to reverse course on marriage equality ahead of #SCOTUS http://t.co/R6Lxddt1mG — Kathryn Elizabeth (@rynthetyn) March 25, 2013

Got it in just under the wire RT @joshtpm Mark Warner Announces Support For Marriage Equality http://t.co/5dbCj15zZh — Greg Sargent (@ThePlumLineGS) March 25, 2013

Sunday might have been the unofficial deadline, though.

Why is this taking so long? “@postlocal: Virginia Sen. Mark Warner has announced his support for gay marriage http://t.co/yUBWtJQDDy” — Roy (@NeroyMartin) March 25, 2013

Jump in, all y'all politicians. This is about to be decided FOR YOU BY THE SUPREME COURT who hears arguments… http://t.co/eRgxO7JzL8 — Mary Smith (@marymoransmith) March 25, 2013

"Like many Virginians and Americans, my views on gay marriage have evolved," says Senator who is just in time http://t.co/7a72264CHB — Brian Ries (@moneyries) March 25, 2013

Mark Warner: “I support marriage equality because it is the fair and right thing to do” /and Time was about to write an article about me — Michael Shure (@michaelshure) March 25, 2013

Warner read the tea leaves and he saw where the votes for and against gay marriage were. Another death blow to the… http://t.co/ijmIvAiZwI — Dunstan Harding (@YeOldeSnark) March 25, 2013

Was it yesterday? RT @thinkprogress VA Senator Mark Warner: Marriage equality ‘is the fair and right thing to do’ http://t.co/zcSZrhbQzB — David Roberts (@drvox) March 25, 2013