Seven senators who have embraced same-sex marriage in 2013

Sen. Kay HaganKay HaganPhoto finish predicted for Trump, Clinton in North Carolina Are Senate Republicans facing an election wipeout? Clinton's lead in NC elevates Senate race 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 PortmanRob PortmanGrassley accuses Reid of 'pure unfiltered partisanship' Senate passes funding bill to avoid shutdown Ryan optimistic about GOP majorities in House and Senate MORE (R-Ohio), Mark BegichMark BegichRyan's victory trumps justice reform opponents There is great responsibility being in the minority Senate GOP deeply concerned over Trump effect MORE (D-Alaska), Claire McCaskillClaire McCaskillThe Trail 2016: Miss Universe crashes campaign McCaskill goes after Trump's weight Top general: 9/11 bill could subject US troops to foreign courts MORE (D-Mo.), Mark WarnerMark WarnerDemocrats press Wells Fargo CEO for more answers on scandal Democratic tax bill targets foreign reinsurance transactions Leahy wants Judiciary hearing on Yahoo MORE (D-Va.), Jay RockefellerJay RockefellerLobbying world Overnight Tech: Senators place holds on FCC commissioner Overnight Tech: Senate panel to vote on Dem FCC commissioner MORE (D-W.Va.) and Jon TesterJon TesterDemocrats press Wells Fargo CEO for more answers on scandal Overnight Finance: Senate rejects funding bill as shutdown looms | Labor Dept. to probe Wells Fargo | Fed to ease stress test rules for small banks Overnight Energy: Judges scrutinize Obama climate rule 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 PryorCotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm Top Democrats are no advocates for DC statehood MORE (Ark.), Tom CarperTom CarperOvernight Healthcare: McConnell unveils new Zika package | Manchin defends daughter on EpiPens | Bill includes M for opioid crisis Dems to GOP: Help us fix ObamaCare Overnight Finance: Trump promises millions of jobs | Obama taps Kasich to sell trade deal | Fed makes monetary policy video game | Trump vs. Ford MORE (Del.), Bob CaseyBob CaseyDems to GOP: Help us fix ObamaCare Enough bickering, time to stay focused on important issues: Pennsylvania holds keys in Clinton-Trump tilt MORE Jr. (Pa.), Joe DonnellyJoe DonnellyOvernight Finance: Senate rejects funding bill as shutdown looms | Labor Dept. to probe Wells Fargo | Fed to ease stress test rules for small banks Overnight Energy: Judges scrutinize Obama climate rule Funding bill rejected as shutdown nears MORE (Ind.), Tim JohnsonTim JohnsonBank lobbyists counting down to Shelby’s exit Former GOP senator endorses Clinton after Orlando shooting Housing groups argue Freddie Mac's loss should spur finance reform MORE (S.D.), Heidi HeitkampHeidi HeitkampDemocrats press Wells Fargo CEO for more answers on scandal Wells Fargo board to decide on executive clawbacks Week ahead: Funding fight dominates Congress MORE (N.D.), Mary LandrieuMary LandrieuLouisiana needs Caroline Fayard as its new senator La. Senate contender books seven-figure ad buy Crowded field muddies polling in Louisiana Senate race MORE (La.), Joe ManchinJoe ManchinMylan CEO should be ashamed of EpiPen prices Overnight Finance: Senate rejects funding bill as shutdown looms | Labor Dept. to probe Wells Fargo | Fed to ease stress test rules for small banks Overnight Energy: Judges scrutinize Obama climate rule MORE (W.Va.) and Bill NelsonBill NelsonOvernight Finance: Senate rejects funding bill as shutdown looms | Labor Dept. to probe Wells Fargo | Fed to ease stress test rules for small banks Overnight Energy: Judges scrutinize Obama climate rule Funding bill rejected as shutdown nears 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 Rodham ClintonCongress steamrolls Obama's veto Trump: I saved former Miss Universe's job 'and look what I get out of it' Carson: Trump faces a debate 'learning curve' 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.