Ken White, writing at the Atlantic:
If I ask 10 physics professors what will happen if I drop my pencil and why, they will all say: “It will fall, because of gravity.” There is very little risk that they will say “Well, maybe it will fall or maybe it won’t” because they think gravity is unfair. But if I put 10 law or political-science professors on TV and ask them whether particular speech is protected by the First Amendment, there is a substantial chance that some of them will give responses based on what they think the law ought to be, not based on what it is.