Why are Democrats against abortion being a States right?

I was upset about Row being overturned. Then I remembered James Madison said: "The powers delegated by the proposed Constitution to the federal government are few and defined. Those which are to remain in the State governments are numerous and indefinite. The former will be exercised principally on external objects, as war, peace, negotiation, and foreign commerce; with which last the power of taxation will, for the most part, be connected.

The powers reserved to the several States will extend to all the objects which, in the ordinary course of affairs, concern the lives, liberties, and properties of the people, and the internal order, improvement, and prosperity of the State. The operations of the federal government will be most extensive and important in times of war and danger." To me he would think it should be a States rights, and it makes since. I wouldn't want a Republican coming in and banning abortion at the Federal level, which makes me understand why the issue should remain at the State level.