Seven senators who have embraced same-sex marriage in 2013

Sen. Kay HaganKay HaganPolitics is purple in North Carolina Democrats can win North Carolina just like Jimmy Carter did in 1976 North Carolina will be a big battleground state in 2020 MORE (D-N.C.) on Wednesday became the seventh senator and sixth Senate Democrat to announce her support for same-sex marriage this year.

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The other senators who have shifted their positions in the last month are Rob PortmanRobert (Rob) Jones PortmanMcConnell names Senate GOP tax conferees Overnight Finance: House approves motion to go to tax conference — with drama | GOP leaders to consider Dec. 30 spending bill | Justices skeptical of ban on sports betting | Mulvaney won't fire official who sued him How four GOP senators guided a tax-bill victory behind the scenes MORE (R-Ohio), Mark BegichMark Peter BegichPerez creates advisory team for DNC transition The future of the Arctic 2016’s battle for the Senate: A shifting map MORE (D-Alaska), Claire McCaskillClaire Conner McCaskillDemocrats turn on Al Franken Trump rips Dems a day ahead of key White House meeting The Hill's 12:30 Report MORE (D-Mo.), Mark WarnerMark Robert WarnerSenate panel moves forward with bill to roll back Dodd-Frank Comey back in the spotlight after Flynn makes a deal Warner: Every week another shoe drops in Russia investigation MORE (D-Va.), Jay RockefellerJay RockefellerOvernight Tech: Trump nominates Dem to FCC | Facebook pulls suspected baseball gunman's pages | Uber board member resigns after sexist comment Trump nominates former FCC Dem for another term Obama to preserve torture report in presidential papers MORE (D-W.Va.) and Jon TesterJonathan (Jon) TesterGOP and Dems bitterly divided by immigration Senate panel moves forward with bill to roll back Dodd-Frank GOP defeats Schumer bid to delay tax vote MORE (D-Mont.). Portman is the only Republican senator to back gay marriage.

Only nine Senate Democrats have not publicly embraced same-sex marriage, according to a report by Time magazine. 

Sens. Mark PryorMark PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (Ark.), Tom CarperThomas (Tom) Richard CarperAvalanche of Democratic senators say Franken should resign Overnight Cybersecurity: Mueller probe cost .7M in early months | Senate confirms Homeland Security nominee | Consumer agency limits data collection | Arrest in Andromeda botnet investigation Senate panel moves forward with bill to roll back Dodd-Frank MORE (Del.), Bob CaseyRobert (Bob) Patrick CaseyThe Hill's 12:30 Report Avalanche of Democratic senators say Franken should resign Dems look to use Moore against GOP MORE Jr. (Pa.), Joe DonnellyJoseph (Joe) Simon DonnellyTrump rips Dems a day ahead of key White House meeting The Hill's 12:30 Report Avalanche of Democratic senators say Franken should resign MORE (Ind.), Tim JohnsonTim JohnsonCourt ruling could be game changer for Dems in Nevada Bank lobbyists counting down to Shelby’s exit Former GOP senator endorses Clinton after Orlando shooting MORE (S.D.), Heidi HeitkampMary (Heidi) Kathryn HeitkampThe Hill's 12:30 Report Avalanche of Democratic senators say Franken should resign Senate panel moves forward with bill to roll back Dodd-Frank MORE (N.D.), Mary LandrieuMary LandrieuProject Veritas at risk of losing fundraising license in New York, AG warns You want to recall John McCain? Good luck, it will be impossible CNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' MORE (La.), Joe ManchinJoseph (Joe) ManchinTrump rips Dems a day ahead of key White House meeting Senate panel moves forward with bill to roll back Dodd-Frank Wealthy outsiders threaten to shake up GOP Senate primaries MORE (W.Va.) and Bill NelsonClarence (Bill) William NelsonOvernight Health Care: Ryan's office warns he wasn't part of ObamaCare deal | House conservatives push for mandate repeal in final tax bill | Dem wants probe into CVS-Aetna merger Ryan's office warning he wasn't part of deal on ObamaCare: source Overnight Health Care: Funding bill could provide help for children's health program | Questions for CVS-Aetna deal | Collins doubles funding ask for ObamaCare bill MORE (Fla.) are the Democratic senators who have not backed gay marriage.

Polls show a majority of voters now support gay marriage, and Democratic politicians in particular have raced to side themselves with public opinion. 

President Obama announced his support for gay marriage last year, and earlier this month former Secretary of State Hillary ClintonHillary Diane Rodham ClintonGrassley blasts Democrats over unwillingness to probe Clinton GOP lawmakers cite new allegations of political bias in FBI Top intel Dem: Trump Jr. refused to answer questions about Trump Tower discussions with father MORE said she supported gay marriage. 

The Supreme Court has heard two cases on the issue this year. Many expect the court will strike down the federal Defense of Marriage Act, which prohibits same-sex couples from getting certain benefits offered to married couples.

It's unclear whether more Senate Democrats or Republicans will shift their positions in the coming days. 

Manchin, Johnson and Pryor have expressed opposition to gay marriage, while Landrieu and Donnelly did not respond to requests for comment from Time, according to the publication's report. All five hail from states that Obama lost in the 2012 presidential election, though Obama did win Indiana in 2008.

Casey, Carper, Heitkamp and Nelson do not back same-sex marriage. All four have either opposed new legislation banning same-sex marriage or been clear proponents of civil unions and rights for same-sex couples.