Ron Paul might be striking out in his pursuit of the Republican presidential nomination, but the activist energy his campaign unleashed in Minnesota is positioning one of his followers as the party's unlikely favorite to take on U.S. Sen. Amy Klobuchar in November. Kurt Bills is a rookie state representative from Rosemount and a high school economics teacher. Until he made a late and unexpected entry into the race in March, Bills was never mentioned as a Republican prospect to challenge Democratic incumbent Klobuchar. But in recent weeks, an increasing number of Republicans have pegged him as the frontrunner to...