"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 Steven KirkThis week: Trump heads to Capitol Hill Trump attending Senate GOP lunch Tuesday High stakes as Trump heads to Hill 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 ManchinJoseph (Joe) ManchinThe Hill's Morning Report — Sponsored by PhRMA — Trump caves under immense pressure — what now? Election Countdown: Family separation policy may haunt GOP in November | Why Republican candidates are bracing for surprises | House Dems rake in record May haul | 'Dumpster fire' ad goes viral Manchin up 9 points over GOP challenger in W.Va. Senate race MORE (W.Va.), Joe DonnellyJoseph (Joe) Simon DonnellyElection Countdown: Family separation policy may haunt GOP in November | Why Republican candidates are bracing for surprises | House Dems rake in record May haul | 'Dumpster fire' ad goes viral Actress Marcia Gay Harden urges Congress to boost Alzheimer's funding Manchin becomes final Democrat to back bill preventing separation of immigrant families MORE (Ind.), Tim JohnsonTimothy (Tim) Peter JohnsonSenate GOP rejects Trump’s call to go big on gun legislation Court ruling could be game changer for Dems in Nevada Bank lobbyists counting down to Shelby’s exit MORE (S.D.), Heidi HeitkampMary (Heidi) Kathryn HeitkampHeitkamp ad highlights record as Senate race heats up Supreme Court rules states can require online sellers to collect sales tax Election Countdown: Family separation policy may haunt GOP in November | Why Republican candidates are bracing for surprises | House Dems rake in record May haul | 'Dumpster fire' ad goes viral MORE (N.D.), Mary LandrieuMary Loretta LandrieuLandrieu dynasty faces a pause in Louisiana Senate GOP rejects Trump’s call to go big on gun legislation Project Veritas at risk of losing fundraising license in New York, AG warns MORE (La.) and Mark PryorMark Lunsford 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 RockefellerJohn (Jay) Davison RockefellerSenate GOP rejects Trump’s call to go big on gun legislation Overnight 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 MORE (W.Va.), Mark WarnerMark Robert WarnerVirginia Dems want answers on alleged detention center abuse Wray defends FBI after 'sobering' watchdog report Top Dems: IG report shows Comey's actions helped Trump win election MORE (Va.), Bob CaseyRobert (Bob) Patrick CaseyAction by Congress is needed to help victims of domestic violence Poll: Casey holds double-digit lead over Barletta in Pa. Senate race Ivanka Trump to press Senate on vocational training bill MORE (Pa.), Kay HaganKay Ruthven Hagan2020 Dems compete for top campaign operatives Senate GOP rejects Trump’s call to go big on gun legislation Politics is purple in North Carolina MORE (N.C.), Claire McCaskillClaire Conner McCaskillThe American economy is stronger than ever six months after tax cuts The Hill's Morning Report — Sponsored by PhRMA — Immigration drama grips Washington Conservative group calls for ethics probe into McCaskill’s use of private plane MORE (Mo.), Mark BegichMark Peter BegichFormer Alaska senator jumps into governor race Overnight Energy: Trump directs Perry to stop coal plant closures | EPA spent ,560 on customized pens | EPA viewed postcard to Pruitt as a threat Perez creates advisory team for DNC transition MORE (Alaska), Jon TesterJonathan (Jon) TesterDonald Trump Jr. headlines Montana Republican convention Overnight Defense: Trump orders Pentagon to help house immigrant families | Mattis says 'space force' needs legislation | VA pick gets hearing date Election Countdown: Family separation policy may haunt GOP in November | Why Republican candidates are bracing for surprises | House Dems rake in record May haul | 'Dumpster fire' ad goes viral MORE (Mont.) and Tom CarperThomas (Tom) Richard CarperOvernight Energy: Inhofe defends Pruitt after criticisms | Agency releases study on water contaminant | Trump rescinds Obama ocean policy Dems press EPA nominees on ethics, climate Overnight Energy: Senate panel sets Pruitt hearing | Colorado joins California with tougher emissions rules | Court sides with Trump on coal leasing program MORE (Del.). Besides Kirk, Sen. Rob PortmanRobert (Rob) Jones PortmanSenate moving ahead with border bill, despite Trump 13 GOP senators ask administration to pause separation of immigrant families Lawmakers, businesses await guidance on tax law MORE (R-Ohio) supports same-sex marriage. Portman made the announcement in March.