David Hansen tried to get the words out. "I lost my health care," he began to say, his voice unexpectedly cracking, barely audible in the din of a people-packed and sweltering warehouse in Nicholasville, Kentucky. At 59, a US Navy veteran and registered Republican, Hansen lowered his head, unable to look at Democrat Amy McGrath, the congressional candidate headlining this political event in the small town outside Lexington.