WASHINGTON — The U.S. Supreme Court was clearly and noticeably divided today in the latest challenge to President Barack Obama’s health-care overhaul, this time over the tax subsidies that make insurance affordable for millions of Americans. The justices aggressively questioned lawyers on both sides of what Justice Elena Kagan called “this never-ending saga,” the latest politically charged fight over the Affordable Care Act. Chief Justice John G. Roberts Jr. said almost nothing in nearly 90 …