Sometimes voters get behind an idea, and we think to ourselves, why? Why are they even bothering when that idea, were it to become law, would be struck down as unconstitutional faster than we can utter “temporary restraining order?” We smugly revisited that thought on Tuesday upon hearing that the Denver-based 10th Circuit had upheld a lower-court ruling keeping an amendment to the Oklahoma constitution from becoming law. The amendment, overwhelmingly approved by Oklahoma voters last year, prevents judges from basing rulings on international law — and specifically mentions Islamic law, often known as Shariah law.