Sen. Lisa MurkowskiLisa Ann MurkowskiGOP, Dem lawmakers come together for McCain documentary Dem rep to launch discharge petition to force net neutrality vote in House Hillicon Valley: Senate votes to save net neutrality | Senate panel breaks with House, says Russia favored Trump in 2016 | Latest from Cambridge Analytica whistleblower | Lawmakers push back on helping Chinese tech giant 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 Steven KirkThis week: Trump heads to Capitol Hill Trump attending Senate GOP lunch Tuesday High stakes as Trump heads to Hill MORE (Ill.) and Rob PortmanRobert (Rob) Jones PortmanWATCH: Sen. Flake: “More doubtful” North Korean summit will happen  Lobbying world Trump-backed congressman wins Ohio Senate primary 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."