The online survey showed increased backing from Republicans and, crucially, the political independents whose support will be essential to winning the November 6 presidential election.
Thirty-eight percent of independents support the healthcare overhaul in the poll conducted after the court ruled Thursday the law was constitutional. That was up from 27 percent from a Reuters/Ipsos poll taken days before the justices' ruling.
Among all registered voters, support for the law rose to 48 percent, from 43 percent before the court decision.
Republican opposition to the law stayed strong, if somewhat weaker than before the High Court ruled. Eighty-one percent of Republicans opposed it in the most recent survey, down from 86 percent in the poll conducted June 19-23.
Underscoring the intense polarization on the issue, three-quarters of Democrats backed the bill, the same as a week earlier.
In some good news for Republicans, the Supreme Court ruling is energizing opposition to the 2010 healthcare overhaul.
In the new poll, more than half of all registered voters - 53 percent - said they were more likely to vote for their member of Congress if he were running on a platform of repealing the law, up from 46 percent before the ruling.Gallup reports:
Americans are sharply divided over Thursday's Supreme Court decision on the 2010 healthcare law, with 46% agreeing and 46% disagreeing with the high court's ruling that the law is constitutional. Democrats widely hail the ruling, most Republicans pan it, and independents are closely divided...
Americans who say they will vote only for a candidate who shares their view on healthcare reform are more likely to disagree than agree with the court's decision, by 59% to 36%. This translates to 12% of all Americans who say they will base their vote on the issue and who oppose the decision, and 7% who will base their vote on the issue and who support the decision. Thus, there is a slight potential net advantage for the anti-healthcare-reform position at the ballot box stemming from Thursday's decision.