"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 KirkMcConnell: Senate to try to repeal ObamaCare next week GOP senator: Not 'appropriate' to repeal ObamaCare without replacement GOP's repeal-only plan quickly collapses in Senate 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 ManchinManchin bashes GOP candidate for pushing McCain to resign McCain’s primary challenger asks him to step aside after diagnosis Governors-turned-senators meet to talk healthcare MORE (W.Va.), Joe DonnellyJoe DonnellyIndiana GOP rep: Likely primary opponent 'lying about my family' Dem senator to sell stock in family company that uses outsourced labor Vulnerable senators raise big money ahead of 2018 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 HeitkampRegulatory experts push Senate leaders for regulatory reform Why governors hold power in the battle for GOP healthcare votes Vulnerable senators raise big money ahead of 2018 MORE (N.D.), Mary LandrieuMary LandrieuCNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' CNN's Van Jones: O'Keefe Russia 'nothingburger' video 'a hoax' Trump posts O'Keefe videos on Instagram MORE (La.) and 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.).

The lawmakers who recently reversed their position and now support same-sex marriage are Democratic Sens. 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 (W.Va.), Mark WarnerMark WarnerTalk of Trump pardons reverberates on Sunday shows Trump: Everyone agrees the president has 'complete power to pardon' Susan Rice met with Senate Intelligence Committee as part of Russia probe MORE (Va.), Bob CaseyBob CaseyDem leaders amp up calls for bipartisan ObamaCare fixes Let’s not roll back bipartisan progress on global food security Vulnerable senators raise big money ahead of 2018 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 McCaskillPentagon to address M spent on untested Afghan camouflage: report Federal Election Commission must not shy away from Russia probe Senate Dems warn potential Missouri GOP recruit with opposition research dump MORE (Mo.), Mark BegichMark BegichPerez creates advisory team for DNC transition The future of the Arctic 2016’s battle for the Senate: A shifting map MORE (Alaska), Jon TesterJon TesterVulnerable senators raise big money ahead of 2018 'Kate's Law' battle shifts to the Senate, testing Dems Democrats go in for the kill on ObamaCare repeal MORE (Mont.) and Tom CarperTom CarperGovernors-turned-senators meet to talk healthcare Overnight Healthcare: GOP'S repeal-only plan quickly collapses in Senate Dem leaders amp up calls for bipartisan ObamaCare fixes MORE (Del.). Besides Kirk, Sen. Rob PortmanRob PortmanOPINION | They told us to abandon ObamaCare — then came the resistance Regulatory experts push Senate leaders for regulatory reform Conservative group to give GOP healthcare holdouts ‘Freedom Traitors Award’ MORE (R-Ohio) supports same-sex marriage. Portman made the announcement in March.