A Wisconsin state judge violated the Sixth Amendment when he denied a defendant’s request to represent himself at his trial on charges of assaulting his wife, a federal appeals court held Tuesday. The 7th U.S. Circuit Court of Appeals agreed with Andrew L. Jackson that the Wisconsin Court of Appeals unreasonably applied legal precedent when it affirmed the judge’s decision. Defendants have the right to represent themselves at trial “so long as they competently choose to do so,” a panel of the court wrote in a per curiam …