No, but I would support it if federal money wasn't attached. I have nothing against the idea of states coming together to write a common curriculum, but if it is truly state-led, as its proponents would defend, the federal government ought to be neutral to its implementation.
Again, 2+2 does not change based on what state you're in. Why should it be taught differently by state? You're just knee jerk opposing something because it involves the federal government but the federal government's involvement is totally rational and justified. Also, it would lead to less bureaucracy. You're literally proposing 50 different systems all at once vs. a single one.