A record number of Americans want Obamacare repealed, according to a new CBS News poll released Wednesday.

The survey found that 39 percent of respondents want Congress to repeal the Patient Protection and Affordable Care Act — the highest share ever recorded in the survey — versus 36 percent who want to keep or expand Obamacare.

Those findings give ammunition to Republicans who have repeatedly called for repealing President Obama’s signature legislative achievement. Just last week, the Republican-controlled House passed bills that would delay Obamacare’s individual and employer mandates.

During a speech in Galesburg, Ill., on Wednesday, Obama slammed Republicans for their extensive campaign to repeal his health care overhaul.

But the White House has been on the defensive ever since the administration decided to delay until 2015 the provision that required companies with 50 or more employees to provide their workers with health insurance or pay a fine.

The poll also found that 54 percent of those surveyed disapprove of the law, 36 percent support it and 10 percent don’t know enough about the reforms to have an opinion. And just 13 percent of respondents say the law would personally help them, compared with 38 percent who said Obamacare would “hurt me.”

The White House has begun a new public relations blitz to win over critics. But Republicans are plenty eager to use the unpopular health blueprint against red-state Democrats who have tried to distance themselves from Obamacare ahead of the 2014 mid-term elections.