Broadcasters are threatening to stand in the way of next year's highly anticipated airwave auction, putting one the Obama administration’s top priorities at risk. Officials in the broadcast and wireless industry are hopeful that a new lawsuit from the National Association of Broadcasters will put pressure on the Federal Communications Commission (FCC) to reach a reach a compromise to save the auction — expected to net billions of dollars — from would could be a months-long delay. “This lawsuit puts a cloud over the auction,” said one Republican FCC aide. “It would make sense for the Commission to work something...