Less than a year after being released from prison, whistleblower Chelsea Manning, known mostly for releasing a series of military logs and diplomatic cables to WikiLeaks, has filed to run for U.S. Senate in Maryland as a Democrat. She almost certainly won’t defeat her primary opponent, incumbent Senator Ben Cardin. That doesn’t matter. If Chelsea Manning were to miraculously win both the Democratic primary and general election, it’s even less likely that she would be able to accomplish any of her main policy goals. Few if any other senators would sign on to immediately abolishing Immigration...