So might have said Supreme Justice Taney in 1856, Dred Scott v. Sandford! Well, then count me as a Republican, as the current Wikipedia entry says:
Democrats characterized Republicans as lawless rebels, provoking disunion by their unwillingness to accept the Supreme Court's decision as the law of the land.
You're reaching here...you're trying to equate involuntary servitude, pre-civil war, which was legally muddled by definition...with a clear contract, freely entered into.
That has some sway with some, I suppose.