If a stranger claiming to be from the government calls to offer you an "Obamacare card" or threatens to throw you in jail unless you buy insurance, hang up the phone. It's a scam. Fraudsters are poised to take advantage of widespread confusion over the Affordable Care Act — also known as Obamacare — to steal Americans' credit cards, Social Security numbers and other personal information, consumer advocates and government officials say. "This is the huge, new government program. There's no doubt in my mind that the fraudsters view it as an opportunity to rip people off," said Lois Greisman, associate director for the Federal Trade Commission's division of marketing practices.