Labor leaders bet big on an Obama victory in 2008, hoping Congress would enact, and the Democratic president would sign, "card-check" -- legislation designed to turn around labor's sagging membership rolls by ending secret-ballot elections in organizing drives. But card-check has never been able to pass the Senate -- not even when Democrats took over Congress in 2006. Instead, presidential appointees friendly to labor are deploying agency muscle. The latest example is taking place largely out of sight -- at the National Mediation Board, a little known agency that oversees union elections for railroads and airlines. Late in 2010, flight...