Sen. Jeff MerkleyJeff MerkleyA proposal to tackle congressional inside trading: Invest in the US Democratic senators call on Biden to support waiving vaccine patents Lobbying world MORE (D-Ore.) on Tuesday joined a Senate Democratic bill that would amend ObamaCare to let people keep insurance plans that are being canceled under the law.

Merkely and Sen. Dianne FeinsteinDianne Emiel FeinsteinOvernight Defense: Army moves to combat sexual crimes | Eight West Point cadets expelled | Democratic senators want to restrict F-35 sale to UAE A proposal to tackle congressional inside trading: Invest in the US Democratic senators seek to constrain F-35 sale to UAE MORE (D-Calif.) both joined the Keeping the Affordable Care Act Promise Act on Tuesday. That makes six Democrats in support of the law, including sponsor Mary LandrieuMary Loretta LandrieuCassidy wins reelection in Louisiana Bottom line A decade of making a difference: Senate Caucus on Foster Youth MORE (D-La.).

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On Wednesday, Landrieu tweeted that Merkely is joining the "growing coalition" supporting her bill in the Senate.

Like Landrieu, Merkley is up for reelection next year, as are Sens. Kay HaganKay Ruthven HaganBiden's gun control push poses danger for midterms The two women who could 'cancel' Trump 10 under-the-radar races to watch in November MORE (D-N.C.) and Mark PryorMark Lunsford PryorBottom line Everybody wants Joe Manchin Cotton glides to reelection in Arkansas MORE (D-Ark.).

Landrieu's bill was introduced last week in response to the growing realization that millions of Americans will not be able to keep their current health insurance plan under ObamaCare due to new insurance standards in the law. That goes against President Obama's promise that if people like their health plan under the law, they would be able to keep it.

The addition of Merkley and Feinstein puts more pressure on the Obama administration to either find some administrative fix to the law, or accept congressional action.

The House will pass separate legislation on Friday from Rep. Fred Upton (R-Mich.) that would let people keep their plans.