...The usual refrain among Republicans is that Congress should always be looking to “return power to the states.” But as George Mason University law professor Michael Greve explains in his book, The Upside-Down Constitution, the manner in which the federal government empowers states matters. Through “competitive federalism,” states are free to tax and regulate their own citizens as they see fit, and citizens and businesses can then move between the states. This is Greve’s Constitutional ideal. But under “cartel federalism,” which is what most of our federalist system has degenerated into, the federal government taxes everyone and then gives grants...