Sen. 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 (D-S.D.) announced his support for same-sex marriage on Monday, leaving just three Senate Democrats opposed to gay marriage.

“After lengthy consideration, my views have evolved sufficiently to support marriage-equality legislation,” Johnson said in a statement. “This position doesn’t require any religious denomination to alter any of its tenets; it simply forbids government from discrimination regarding who can marry whom.” 

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Sens. Joe ManchinJoseph (Joe) ManchinOvernight Energy: EPA aims to work more closely with industry Overnight Finance: Lawmakers grill Equifax chief over hack | Wells Fargo CEO defends bank's progress | Trump jokes Puerto Rico threw budget 'out of whack' | Mortgage tax fight tests industry clout Lawmakers try again on miners’ pension bill MORE (W.Va.), Mary LandrieuMary LandrieuYou want to recall John McCain? Good luck, it will be impossible CNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' CNN's Van Jones: O'Keefe Russia 'nothingburger' video 'a hoax' 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.) are the only Democrats in the Senate who remain opposed to gay marriage. 

Over the last several weeks, a dozen Democrats and two Republicans have endorsed gay marriage, which polls suggest is now favored by a majority of voters. 

Gay-rights advocates are hopeful that the growing public support will herald the striking down of prohibitions on same-sex marriage throughout the country.

The Supreme Court last month held hearings on cases challenging the constitutionality of California’s Proposition 8, which banned gay marriage in the state, and the federal Defense of Marriage Act (DOMA), which denies some benefits to same-sex partners.

Johnson follows Sens. Joe DonnellyJoseph (Joe) Simon DonnellyKoch-backed group targets red-state Dems on tax reform Dems plan to make gun control an issue in Nevada Agricultural trade demands investment in MAP and FMD MORE (D-Ind.) and Heidi HeitkampMary (Heidi) Kathryn HeitkampWells Fargo chief defends bank's progress in tense Senate hearing Dems plan to make gun control an issue in Nevada Red-state Dems need more from Trump before tax embrace MORE (D-N.D.), who announced their support for gay marriage on Friday. Sens. Mark KirkMark KirkGiffords, Scalise highlight party differences on guns Stale, misguided, divisive: minimum wage can't win elections Immigration critics find their champion in Trump MORE (Ill.) and Rob PortmanRobert (Rob) Jones PortmanOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Reddit hires first lobbyists Senate panel approves bill compelling researchers to ‘hack’ DHS MORE (Ohio) are the only Republicans to publicly back same-sex marriage.

In March, Johnson announced that he would not run for reelection.