Sen. 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 (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 Finance: House sends Dodd-Frank rollbacks to Trump | What's in the bill | Trump says there is 'no deal' to help ZTE | Panel approves bill to toughen foreign investment reviews House votes to ease regulation of banks, sending bill to Trump Senators demand answers on Trump’s ZTE deal MORE (W.Va.), 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.) 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 DonnellyOvernight Health Care — Sponsored by PCMA — House passes 'right to try' drug bill | Trump moves to restrict abortion referrals House votes to ease regulation of banks, sending bill to Trump House approves 'right to try,' sends bill to Trump's desk MORE (D-Ind.) and Heidi HeitkampMary (Heidi) Kathryn HeitkampThe Hill's Morning Report — Sponsored by PhRMA — Republicans see some daylight in midterm polling Trump urges anti-abortion advocates to rally in November House votes to ease regulation of banks, sending bill to Trump MORE (D-N.D.), who announced their support for gay marriage on Friday. Sens. Mark KirkMark Steven KirkThis week: Trump heads to Capitol Hill Trump attending Senate GOP lunch Tuesday High stakes as Trump heads to Hill MORE (Ill.) and Rob PortmanRobert (Rob) Jones PortmanLongtime tax aide leaving Senate Finance Committee Ex-McConnell policy aide joining lobby firm WATCH: Sen. Flake: “More doubtful” North Korean summit will happen  MORE (Ohio) are the only Republicans to publicly back same-sex marriage.

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