BOSTON -- It's not often one gets a quiet afternoon away from the office to run errands. When you're campaigning for president of the United States, those moments can be even more fleeting. John Kerry was home in Boston Friday for what was billed as a day off. But a routine trip out on a snowy afternoon by the presumed Democratic nominee quickly turned into a big-time production. The Massachusetts senator and his daughter Vanessa, 27, were escorted from their red brick townhouse in Beacon Hill to a nearby Borders bookstore by a seven-car motorcade -- two police cars, three...