It's because Walker is following generally accepted legal principles.
(Unlike county judges who don't bother with separation-of-powers technicalities in Constitutions.)
Wisconsin native, conservative critic of everything. "Once abolish the God, and the government becomes the God." ---G K Chesterton "The only objective of Liberty is Life" --G K Chesterton "Fallacies do not cease to be fallacies because they become fashions" --G K Chesterton "A man can never have too much red wine, too many books, or too much ammunition." -- Rudyard Kipling