Democratic lobbyist advises corporate chiefs to get their ducks in a row now. By The Wall Street Journal Editorial Board Corporate America, lawyer up. If you’ve done business with the Trump Administration, Democrats are coming after you next year. That isn’t what most Democrats are saying before the election, but it’s part of the battle plan if they take one or both houses of Congress next week. Steve Elmendorf, the longtime Democratic operative, made that clear in a recent chat with independent journalist Brody Mullins. “I think it’s not going to be purely ‘you gave money to the ballroom,’” said Mr. Elmendorf, who is part of a Beltway lobbying shop. “It’s going to be: ‘I gave $20 million to the ballroom, and then I went to DoD, and I got a contract from the government.’” Or: “I gave $10 million to the ballroom, and then I went to the Commerce Department, and Howard Lutnick gave me a tariff exclusion.” That sounds accurate given the partisan times, and it shows the vulnerabilit...