DES MOINES, Iowa -- Ask Patrick Burke why he is spending a frigid, blustery New Year's Day in Iowa trying to help Rick Perry's presidential campaign, and he responds with a sobering answer. Burke, from the North Texas town of Allen, says he is battling mesothelioma, an aggressive cancer, and isn't sure how long he may live. Fulfilling a civic commitment by participating in a presidential campaign -- specifically Perry's -- is on his "bucket list" of things he wants to accomplish before he dies, Burke says. The 55-year-old Air Force veteran and former lawman is one of hundreds of...