NEW YORK — Most Americans want Congress to extend tax credits that, if left to expire at the end of the year, could raise health insurance costs for millions of Americans, according to a new poll released Friday from the health care research nonprofit KFF.

The survey, conducted Sept. 23-29 just prior to the shutdown that began Wednesday, shows initial public support for a move that Democrats demand be included in a government funding bill. A Senate standoff, in part over the enhanced premium tax credits set to end if Congress doesn’t act, resulted in a government shutdown that’s lasted into a third day with no end in sight.

At the same time, the survey showed only about 4 in 10 U.S. adults read “a lot” or “some” about the subsidies as the shutdown began, leaving room for public opinion t

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