[DoodleDawg]

Overrides Article IV, Section 2, does it? Pretty neat trick for a law passed by Congress to actually override the Constitution itself.

No, it didn't and you seem to be the only person crazy enough to say it did. Had a slave fled from Kentucky into Ohio, or from Delaware to Pennsylvania then federal authorities would have been duty bound to return them. But there is no federal crime against a free black person going from Mississippi to Minnesota or any other state. Now is there?

[DiogenesLamp]

The Salient aspect of this clause of the constitution is "held to Service or Labour in one State, under the Laws thereof"

It cannot be just waved away without deliberately violating the intent expressed in this constitutional clause.

But I am well familiar with the phenomena of people who see nothing wrong with ignoring aspects of constitutional law they don't like. The proper way to deal with it is to change it through the amendment process, not to pretend it doesn't exist.