Sen. Jeff MerkleyJeff MerkleySenate GOP blocks defense bill, throwing it into limbo Lawmakers call on Olympic committee to press China on human rights abuses Senate Democrats call on Biden to push for COVID-19 vaccine patent waivers at WTO 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 FeinsteinWhat's that you smell in the Supreme Court? New variant raises questions about air travel mandates Progressive groups urge Feinstein to back filibuster carve out for voting rights or resign 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 HaganInfighting grips Nevada Democrats ahead of midterms Democrats, GOP face crowded primaries as party leaders lose control Biden's gun control push poses danger for midterms 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.