"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 KirkGOP senator: Don't link Planned Parenthood to ObamaCare repeal Republicans add three to Banking Committee Juan Williams: McConnell won big by blocking Obama 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 ManchinOvernight Cybersecurity: Dems split on Manning decision | Assange looking to make deal What we learned from Rick Perry's confirmation hearing Manning commutation sparks Democratic criticism MORE (W.Va.), Joe DonnellyJoe DonnellySenators introduce dueling miners bills Government to begin calling Indiana residents Hoosiers Pence meets with Kaine, Manchin amid Capitol Hill visit 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 HeitkampSenate Democrats brace for Trump era Senators introduce dueling miners bills A small business executive order: Justification for regulation 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 WarnerGOP, Dems hear different things from Trump Decaying DC bridge puts spotlight on Trump plan Overnight Cybersecurity: Dems split on Manning decision | Assange looking to make deal MORE (Va.), Bob CaseyBob CaseyLive coverage: Senators grill Trump's Treasury pick Live coverage: Tom Price's confirmation hearing Senate Democrats brace for Trump era MORE (Pa.), Kay HaganKay Hagan Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock 2016’s battle for the Senate: A shifting map MORE (N.C.), Claire McCaskillClaire McCaskillWashington Post reporter compares DC rioters to Boston Tea Party Dem senator: Violent inauguration protesters ‘disgusting’ Five things to watch for in Mnuchin hearing 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 TesterSenators introduce dueling miners bills Live coverage: The Senate's 'vote-a-rama' Dems attack Trump SEC pick's ties to Wall Street MORE (Mont.) and Tom CarperTom CarperPruitt says his EPA will work with the states Dems prepare to face off with Trump's pick to lead EPA Justice, FBI to be investigated over Clinton probes MORE (Del.). Besides Kirk, Sen. Rob PortmanRob PortmanHillary gives Bernie cool reception at Trump inaugural lunch GOP governors defend Medicaid expansion Senators introduce dueling miners bills MORE (R-Ohio) supports same-sex marriage. Portman made the announcement in March.