The top lawyer arguing a case to overturn Obamacare subsidies believes he can succeed at crippling the law even if it's upheld in every district and appellate court. A three-judge panel on the D.C. Circuit invalidated the federal exchange subsidies in June. The full court subsequently vacated the ruling and announced it'll re-hear the case, called Halbig v. Burwell. The conservative opponents have a tough battle because the en banc ruling will feature 8 Democratic-appointed judges — four of whom were appointed by President Obama himself — and 5 Republican-appointed judges. Michael Carvin, the lawyer for the plaintiffs, has appealed...