He received no national-party funding, ran what he calls an “old-school” campaign without data-driven analytics, and had only one paid staffer, at $500 per month, but this third-generation dairy farmer from California may just pull out the biggest upset of the 2014 cycle. As of publication time, Republican Johnny Tacherra is leading longtime Democratic lawmaker Jim Costa in the yet-to-be-decided race for the Golden State’s 16th congressional district. With provisional ballots still to be counted, and with a 700-plus-vote cushion, Tacherra is confident that he will survive. He and his wife are heading to Washington, D.C., on Wednesday to take...