Robert Pear, New York Times, July 7, 2012 Washington - Critics of the new health care law, having lost one battle in the Supreme Court, are mounting a challenge to President Obama’s interpretation of another important provision, under which the federal government will subsidize health insurance for millions of low- and middle-income people. Starting in 2014, the law requires most Americans to have health insurance. It also offers subsidies to help people pay for insurance bought through markets known as insurance exchanges. ... Brawling