More than one million Coloradans have rejected political parties and are registered unaffiliated, but they still want a say in picking presidential candidates. This November voters will decide whether to create an open primary and get rid of presidential caucuses in Colorado. Then, one phone call, from Garrison Keillor, changed musician Chris Thile's life. It was an offer to become the new host of the public radio mainstay A Prairie Home Companion. Thile accepted and talked with us about the direction of the show, which will tape in Denver in November. Plus, what voters need to know about a ballot proposal to renew a cultural tax for Metro Denver; how Colorado influenced writer Vladimir Nabokov; and listener feedback to a recent interview with Denver's first pedestrian planner.