Meanwhile, a new study of the type of healthcare plans offered by the Clinton and Obama campaigns argues Clinton’s plan would cover more uninsured Americans. The healthcare economist Jonathan Gruber at MIT says a Clinton-type plan would cover 45 million uninsured at a cost of $124 billion. Obama’s plan would cost less, at $102 billion, but would only cover 23 million people. The plans differ on requiring Americans to buy insurance; the Clinton plan would make it mandatory, while the Obama plan would only require the purchase of insurance for children. Neither plan offers the single-payer system favored by a majority of Americans, according to public opinion polls.