>So, wait, the CP believes that the 13th Amendment is superfluous?
For the purpose of forbidding the draft, yes. The 5th Amendment already does that, as I should have remembered.
Actually, it is almost entirely superfluous now. Even before the Civil War, the courts had ruled ‘Once free, always free.’; it was no longer acceptable to catch slaves in the wild, as it were. The amendment was necessary at the time, but if it were repealed now, then that wouldn't enslave anybody.
However, since slavery does still exist in a few other places in the world, it does potentially have some effect. When slaves are brought to the U.S., they will be freed if their masters get caught. The 13th Amendment itself isn't needed for that, since statutory law covers it, but if you repealed the amendment *and* those laws, then we might be in trouble.
In 1846, Lysander Spooner (abolitionist and constitutionalist) made the argument that slavery did not exist under natural law, and the Constitution's tacit acceptance of it was not sufficient to establish it. If you buy his arguments, then the 13th Amendment was never needed. (Unfortunately, the courts did not buy his arguments, so in practice the amendment was needed.)