In the following video, Motley Fool health care bureau chief Brenton Flynn continues his coverage of all things related to the Affordable Care Act, and discusses an article from Kaiser Health News highlighting the massive enrollment opportunity offered to Medicaid-focused managed care companies(UNH -0.64%). He takes a look at the numbers to show just how big this new opportunity could be, but also warns of some potential uncertainties and headwinds, as this new group of beneficiaries has some qualities that could crimp insurance company profits.