Here is what I wrote for "why I oppose Obamacore (Common Core)" :
The federal government has no authority over the issue of education. No such power is granted to it by the Constitution and the 10th Amendment forbids the United States from exercising powers not delegated to it in the Constitution.
As a state official, you have sworn an oath to uphold both the U.S. and the Ohio Constitutions. If you acquiesce to this usurpation of power, you are violating your oath.