by Maggie Mullen, WyoFile CASPER—For college student Sofia Downing, a summer gig knocking on doors in Wyoming was the chance to make some money, see a different part of the country and get candidates with what she considers conservative values elected to office. “If you don’t like walking around, or you’re more of an introvert, probably not the job for you,” Downing said in late July, standing in the afternoon shade of a tree in the city’s Vall…