[T]he unions may have a fallback position [on card check]: Forget about the secret ballot, and try to pass a bill with mandatory federal arbitration. This might be easier to defend. Every American knows what the secret ballot is; few Americans know what mandatory arbitration means. Mandatory arbitration would be a major, massive change in American labor law. Currently, unions are free to strike, but employers are free to resist their demands as long as they want. The card check bill would require, after only 120 days of bargaining, a federal arbitrator to step in and impose a settlement. A...