These days, John Kerry is swaddled in political bubble wrap, surrounded by Secret Service agents and stalked by a media army. But Kerry wasn't always cordoned off. Back when candidates traveled with a lone aide, it was possible to obtain a revealing portrait of Kerry, free of the hurly-burly of vast entourages. That's what USA Today political columnist Walter Shapiro did as he hit the campaign trail early to write One-Car Caravan, his revealing and witty behind-the-scenes account of the race for the 2004 nomination. Shapiro portrays all the Democratic dreamers at that innocent moment when...