SALT LAKE CITY — Mitt Romney brought his book tour Saturday back to the city where he led the 2002 Winter Olympics, telling an enthusiastic audience he could decide by Christmas whether to run again for president. "That's not a decision we've made at this point," Romney told a 12-year-old boy from Bluffdale who said he was "asking a question that a lot of people are wondering and that's, 'Are you going to run for president?' " The cheers the question received were among the loudest during Romney's hour-long appearance at the Salt Palace as part of his national tour for...