Overloaded websites and jammed phone lines frustrated consumers for a second day as they tried to sign up for health insurance under the nation’s historic health care overhaul. That was putting pressure on the federal government and the states that are running their own insurance exchanges to fix the problems amid strong demand for the private insurance plans. … The delays that continued Wednesday offered one good sign for President Barack Obama and supporters of his signature domestic policy achievement, demonstrating what appeared to be exceptionally high interest in the new system. But the problems also could dampen enthusiasm for...