The US Supreme Court has rejected an appeal to reopen an investigation into whether Governor Scott Walker's campaign illegally coordinated with outside conservative groups during his 2012 recall election. The justices---today---left in place a Wisconsin Supreme Court decision that shut down the probe of the governor. A group of prosecutors began an investigation---the same year---into whether Walker's campaign coordinated with the Wisconsin Club for Growth and other conservative groups on advertising during the recall without reporting the groups' contributions. Conservative-leaning justices---who control the Wisconsin Supreme Court---stopped the investigation last year. They ruled that the coordination amounted to free speech and is NOT subject to disclosure requirements.