Tonight at 7:00 o'clock, the four leading candidates for mayor of Minneapolis will participate in a live debate right here on Minnesota Public Radio. There are 18 other names on the ballot and here on Morning Edition, we've been giving you a chance to hear from them. Today, an interview with Mark Koscielski (ka-SAUL-ski), who calls himself an Independent Fiscal Conservative. He owns the only gun shop in Minneapolis. He told Minnesota Public Radio's Eugene Cha that his experience clashing with government officials in the past has taught him some valuable lessons.