Sen. Lisa MurkowskiLisa MurkowskiThe Memo: Trump seeks to put his stamp on nation Murkowski: I don't have enough information to vote in favor of healthcare bill Four GOP senators will vote against taking up healthcare bill without changes MORE (R-Alaska) on Wednesday became the third Republican in the upper chamber to back same-sex marriage.

"I am a life-long Republican because I believe in promoting freedom and limiting the reach of government. When government does act, I believe it should encourage family values," Murkowski said in a statement posted on her website.

"I support the right of all Americans to marry the person they love and choose because I believe doing so promotes both values: it keeps politicians out of the most private and personal aspects of peoples’ lives — while also encouraging more families to form and more adults to make a lifetime commitment to one another."

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The Alaska senator said she believes in "marriage equality" and supports "the government getting out of the way to let that happen."

Sens. Mark KirkMark KirkGOP senator defends funding Planned Parenthood Why Qatar Is a problem for Washington Taking the easy layup: Why brain cancer patients depend on it MORE (Ill.) and Rob PortmanRob PortmanGOP ObamaCare fight faces do-or-die procedural vote GOP super-PAC promises big spending in 2018 Five takeaways from the CBO score on Senate ObamaCare bill MORE (Ohio) are the two other Senate Republicans who have backed same-sex marriage. A dozen Democrats have made the same switch amid a broader shift in popular opinion.

Murkowski had hinted that she was moving toward supporting same-sex marriage, saying in March to a local Alaska newspaper that her views were "evolving."

"The term 'evolving view' has been perhaps overused, but I think it is an appropriate term for me to use," Murkowsi said at a local event according to the Chugiak-Eagle River Star.

Murkowski's announcement comes as the Supreme Court prepares to rule on the constitutionality of the Defense of Marriage Act and California's Proposition 8, which bans same-sex marriage in the state.

The pro-same sex marriage Human Rights Campaign praised Murkowski's move.

"Sen. Murkowski's courageous and principled announcement today sends a clear message that marriage equality must come to all 50 states in this country," HRC President Chad Griffin said in a statement.

"As the Supreme Court prepares to rule in two landmark marriage cases this month, a growing bipartisan coalition is standing up for the right of all couples to marry — and there is no turning back that tide."