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“People are now, some of them for the first time, realizing all the good things that are in this bill because we’re going to be able to start clearing away the smoke and clutter and misinformation that was put out there,” Mr. Van Hollen said.

He predicted that the Republican argument to repeal the measures won’t go over well with voters.

“I don’t think people are going to want to turn back the clock and put the insurance industry back in charge of their health and their lives,” he said. “Who am I to give political advice to my Republican colleagues? But if they want to have this fight, and they want to stand with the insurance companies against consumers, we’re happy to have that fight.”

Democrats have warned that they plan to to hit hard against Republicans who pledge to repeal the law, which could be a tough decision for moderate Republicans in primaries with conservative “tea party” candidates.

“House Republicans and their desperate candidates will be the ones on defense for their countless lies on behalf of the health insurance industry and for joining with right-wing extremists trying to repeal tax credits to small businesses, the elimination of the [Medicare prescription-drug “doughtnut hole”] for seniors, and for trying to roll back reducing the deficit by more than a trillion dollars over 20 years,” said DCCC spokesman Ryan Rudominer.

Outside groups that supported the health plan have already lined up to back Democrats who may be vulnerable because of their vote in favor of the law.

The AFL-CIO on Tuesday started robo-calls to 1 million activists and union members in swing districts, asking them to contact their member of Congress and thank them for their vote.