"So I will add my name to the petition of senators asking the Supreme Court to declare the law that prohibits gay marriage unconstitutional," Nelson said.

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Eight senate Democrats and two Senate Republicans have recently decided to support same-sex marriage. Before Nelson, Sen. Mark KirkMark KirkLeaked ObamaCare bill would defund Planned Parenthood GOP senator won't vote to defund Planned Parenthood The Hill's 12:30 Report MORE (R-Ill.) announced his support for same-sex marriage.

Nelson's announcement cuts down the number of Senate Democrats who do not support same-sex marriage to six. The remaining Democrats are Sens. Joe ManchinJoe ManchinDem 2020 hopefuls lead pack in opposing Trump Cabinet picks Manchin: Sanders backers should challenge me in Dem primary Greens launch ads against two GOP senators for Pruitt votes MORE (W.Va.), Joe DonnellyJoe DonnellyThe DNC in the age of Trump: 5 things the new chairman needs to do Poll: Senate should confirm Gorsuch A guide to the committees: Senate 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 HeitkampHeidi HeitkampDem 2020 hopefuls lead pack in opposing Trump Cabinet picks The buzzword everyone can agree on in the health debate: RESTORE Greens launch ads against two GOP senators for Pruitt votes MORE (N.D.), Mary LandrieuMary LandrieuFive unanswered questions after Trump's upset victory Pavlich: O’Keefe a true journalist Trump’s implosion could cost GOP in Louisiana Senate race MORE (La.) and 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.).

The lawmakers who recently reversed their position and now support same-sex marriage are Democratic Sens. Jay RockefellerJay RockefellerObama to preserve torture report in presidential papers Lobbying world Overnight Tech: Senators place holds on FCC commissioner MORE (W.Va.), Mark WarnerMark WarnerTop Senate Dem: ‘Grave concerns’ about independence of Russia probe Dems worry too much about upsetting others. That needs to stop. Washington-area lawmakers request GAO report on DC Metro MORE (Va.), Bob CaseyBob CaseyA guide to the committees: Senate GOP loses top Senate contenders How many GOP senators will stand up to megadonor DeVos? Just 2. MORE (Pa.), Kay HaganKay HaganLinking repatriation to job creation Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock MORE (N.C.), Claire McCaskillClaire McCaskillDem 2020 hopefuls lead pack in opposing Trump Cabinet picks Manchin: Sanders backers should challenge me in Dem primary The DNC in the age of Trump: 5 things the new chairman needs to do MORE (Mo.), Mark BegichMark BegichThe future of the Arctic 2016’s battle for the Senate: A shifting map Trump campaign left out of Alaska voter guide MORE (Alaska), Jon TesterJon TesterPoll: Senate should confirm Gorsuch A guide to the committees: Senate GOP loses top Senate contenders MORE (Mont.) and Tom CarperTom CarperA guide to the committees: Senate Senate advances Trump's Commerce pick Warren: Trump's EPA pick the 'attorney general for Exxon' MORE (Del.). Besides Kirk, Sen. Rob PortmanRob PortmanConquering Trump returns to conservative summit ­ObamaCare fix hinges on Medicaid clash in Senate A guide to the committees: Senate MORE (R-Ohio) supports same-sex marriage. Portman made the announcement in March.