As President Obama steps up his push for health care reform, there is a growing effort to stop it, and rising doubts about how Obama is handling the issue. The president said from the first day of his administration that health care was a top domestic priority, and some observers say he’s taking a risk in addressing the nation through a primetime news conference Wednesday with little to show after months of wrangling. Obama and top Democrats are seeking an overhaul to ensure that health insurance is available to the 46 million Americans currently without coverage while preventing costs to both the government and individuals from continuing to climb.