[wideawake]

Did the Founders intend to protect unborn children as "persons" who would be subject to Constitional protections?

Of course they did.

Abortion was universally considered an abomination in the late 1700s.

Strong criminal penalties for such a vicious act were on the books in every state's legal system.

The burden is on the fools who would deny that the Founders intended such a protection.

[LWalk18]

Abortion was universally considered an abomination in the late 1700s.

Yes, but even then it up to each state to pass laws against abortion. You want a national law prohibiting abortion like there is a national law allowing abortion instead of letting people choose. You have to show why abortion is up to the federal goverment instead of the state when other crimes such as murder are not.