One day in July demonstrated the identity crisis facing Kansas Democrats as they seek to capture a congressional seat for the first time in a decade. Roughly 2,000 people packed into a swampy-hot hall at the Reardon Convention Center in Kansas City, Kan., Friday night to hear U.S. Sen. Bernie Sanders, a self-described Democratic socialist, as he led a rally for Brent Welder, a Bonner Springs attorney mounting a campaign for Kansas' 3rd District on an unabashedly progressive platform.