Surprisingly - even shockingly - ignorant. Reuters: Most uninsured adult Americans lack basic knowledge about President Barack Obama's signature healthcare law and haven't visited their online insurance marketplace because they think health insurance is unaffordable, according to a survey released on Thursday.The survey from Enroll America, a non-profit healthcare enrollment coalition, found that 68 percent of uninsured adults had not yet logged onto their online exchanges.A similar number, 69 percent of the uninsured, still lacked knowledge about tax subsidies and other financial help designed to make the Affordable Care Act, better known as Obamacare, affordable for many, the survey...