"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 KirkBattle for the Senate: Top of ticket dominates The untold stories of the 2016 battle for the Senate Women make little gains in new Congress 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 ManchinTrump flirts with Dems for Cabinet Trump meets with Dem senator amid Cabinet speculation Overnight Energy: Walden wins Energy gavel | Trump looks at Dems to head Energy, Interior MORE (W.Va.), Joe DonnellyJoe DonnellyTrump’s vow on Medicare in doubt after HHS choice Red-state Dems face tough votes on Trump picks Red-state Democrat: I'll oppose Trump's health chief 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 HeitkampPriebus says State announcement coming in next 2 weeks Trump flirts with Dems for Cabinet Trump meets with Dem senator amid Cabinet speculation 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 RockefellerLobbying world Overnight Tech: Senators place holds on FCC commissioner Overnight Tech: Senate panel to vote on Dem FCC commissioner MORE (W.Va.), Mark WarnerMark WarnerOvernight Cybersecurity: Last-ditch effort to stop expanded hacking powers fails Intel Dems push for info on Russia and election be declassified Senate Dems push Obama for info on Russian election interference MORE (Va.), Bob CaseyBob CaseySenate passes college anti-Semitism bill Dem senator to Trump: Reject Syria deal with Putin, Assad Vulnerable Dems ready to work with Trump MORE (Pa.), Kay HaganKay HaganGOP senator floats retiring over gridlock 2016’s battle for the Senate: A shifting map The untold stories of the 2016 battle for the Senate MORE (N.C.), Claire McCaskillClaire McCaskillA Cabinet position for Petraeus; disciplinary actions for Broadwell after affair Defense bill tackles retaliation against military sex assault victims Red-state Dems face tough votes on Trump picks 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 TesterRed-state Dems face tough votes on Trump picks Montana Republican warns of Senate challenge to Tester Vulnerable Dems ready to work with Trump MORE (Mont.) and Tom CarperTom CarperOvernight Finance: Trump takes victory lap at Carrier plant | House passes 'too big to fail' revamp | Trump econ team takes shape Warren calls for probe of Trump hotel conflicts of interest Dem: Trump must ensure business deals don't violate Constitution MORE (Del.). Besides Kirk, Sen. Rob PortmanRob PortmanGOP debates going big on tax reform Who is Tim Ryan? A closer look at Pelosi’s challenger Battle for the Senate: Top of ticket dominates MORE (R-Ohio) supports same-sex marriage. Portman made the announcement in March.