Sens. Heidi HeitkampMary (Heidi) Kathryn HeitkampPawlenty opts out of Senate run in Minnesota GOP's Cramer won't run for ND Senate seat GOP Rep. Cramer 'trending' toward ND Senate run MORE (D-N.D.) and Joe DonnellyJoseph (Joe) Simon DonnellyDems search for winning playbook GOP anxious with Trump on trade Blue wave of 2018 stops in Indiana and Missouri MORE (D-Ind.) announced Friday they support same-sex marriage, joining a rush of Democratic senators who have recently come out in favor. 

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Heitkamp and Donnelly's respective announcements leave only four Senate Democrats who don't support same-sex marriage.

The senator from Indiana noted that he voted to repeal the "Don't Ask, don't Tell" law — which barred gays from openly serving in the military — while serving in the House.

"I voted to repeal ‘don't ask, don't tell’ and was an original supporter of the bill that would make it illegal to discriminate against someone in the workplace because of their sexual orientation," Donnelly said in a statement posted on his Facebook. 

"It is also for that reason that I oppose amending either Indiana’s or our nation’s constitution to enshrine in those documents an ‘us’ and a ‘them,’ instead of a ‘we.’"

Donnelly also cited the Supreme Court, which heard oral arguments last week on challenges to California's Proposition 8 law that bans same-sex marriage. The high court also held a hearing on the Defense of Marriage Act (DOMA), which defines marriage as between only a man and a woman in federal law.

"With the recent Supreme Court arguments and accompanying public discussion of same-sex marriage, I have been thinking about my past positions and votes," Donnelly added. "In doing so, I have concluded that the right thing to do is to support marriage equality for all."

Heitkamp's announcement was much more brief. In a short statement, she said she concluded that the federal government should allow same-sex couples to marry.

"In speaking with North Dakotans from every corner of our great state, and much personal reflection, I have concluded the federal government should no longer discriminate against people who want to make lifelong, loving commitments to each other or interfere in personal, private, and intimate relationships," Heitkamp said in her statement. 

"I view the ability of anyone to marry as a logical extension of this belief. The makeup of families is changing, but the importance of family is enduring."

A day earlier, Sen. Bill NelsonClarence (Bill) William NelsonSenate campaign fundraising reports roll in Week ahead: Tech giants to testify on extremist content Puerto Rico's children need recovery funds MORE (D-Fla.) announced his support for same-sex marriage. Besides almost a dozen Democrats who recently came out in support of same-sex marriage, two Republican senators — Mark KirkMark KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns MORE (Ill.) and Rob PortmanRobert (Rob) Jones PortmanFlake's anti-Trump speech will make a lot of noise, but not much sense Top GOP candidate drops out of Ohio Senate race Overnight Tech: Regulators to look at trading in bitcoin futures | Computer chip flaws present new security problem | Zuckerberg vows to improve Facebook in 2018 MORE (Ohio) — recently switched positions and now support same-sex marriage.

The remaining Senate Democrats who don't support same-sex marriage are Sens. Joe ManchinJoseph (Joe) ManchinMcConnell to Dems: Don't hold government 'hostage' over DACA Lawmakers see shutdown’s odds rising Senate campaign fundraising reports roll in MORE (W.Va.), Tim JohnsonTimothy (Tim) Peter 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.), Mary LandrieuMary LandrieuProject Veritas at risk of losing fundraising license in New York, AG warns You want to recall John McCain? Good luck, it will be impossible CNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' 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.).