Opposition to the landmark health care overhaul declined over the past month, to 35 percent from 41 percent, according to the latest results of a tracking poll, reported Thursday.

Fifty percent of the public held a favorable view of the law, up slightly from 48 percent a month ago, while 14 percent expressed no opinion about the measure, according to the poll by the Kaiser Family Foundation.

The approval level was the highest for the legislation since it was enacted in March, after a divisive year-long debate. In April, the poll found 46 percent in favor and 40 percent opposed.