Sen. Mark BegichMark Peter BegichDem Begich concedes Alaska governor race to Republican Dunleavy Democrats gain governorships in red states GOP braces for potential wipeout in governors' races MORE (D-Alaska) late Monday night added his voice to the growing chorus of Democratic senators announcing support for gay marriage ahead of Tuesday's hearing at the Supreme Court.

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"I believe that same-sex couples should be able to marry and should have the same rights, privileges and responsibilities as any other married couple," the Alaskan senator said in a statement obtained by Buzzfeed.

"Government should keep out of individuals' personal lives—if someone wants to marry someone they love, they should be able to. Alaskans are fed up with government intrusion into our private lives, our daily business, and in the way we manage our resources and economy," he continued.

The statement precedes oral arguments at the Supreme Court on Tuesday and Wednesday on a pair of cases examining states' and the federal government's ability to define marriage as a union between a man and a woman.

On Monday, Sens. Mark WarnerMark Robert WarnerBanking panel showcases 2020 Dems Facebook reeling after damning NYT report On The Money: Trump, Senate leaders to huddle on border wall funding | Fed bank regulator walks tightrope on Dodd-Frank | Koch-backed groups blast incentives for corporations after Amazon deal MORE (D-Va.) and Claire McCaskillClaire Conner McCaskillWhy Democratic policies outperform Democratic politicians in rural America Josh Hawley will defend the First Amendment and religious liberty Missouri New Members 2019 MORE (D-Mo.) also announced their support for gay marriage; last week, Republican Sen. Rob PortmanRobert (Rob) Jones PortmanThe case for bipartisan solutions GOP lawmakers condemn attempted attacks on Democrats Trump takes steps to punish Saudi Arabia MORE (Ohio) and former Secretary of State Hillary ClintonHillary Diane Rodham ClintonRetired lieutenant general tears into Trump over attacks against Navy SEAL: 'Disgusting' Retired admiral who oversaw bin Laden raid doubles down on Trump criticism Trump dismisses criticism from Navy SEAL who led Osama bin Laden mission MORE similarly announced shifts on the subject.

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The flood of lawmakers now backing same-sex marriage is partially an indication of shifting national attitudes. A Washington Post / ABC News poll released last week showed that 58 percent of Americans backed gay marriage, an all-time high.