Tiffany Henyard, also known as 'America's worst mayor,' charged the wrong taxpayers and put them out about $10,000 after she went to a glitzy White House conference. In mid-January, Dolton, Illinois Mayor Tiffany Henyard visited the White House and incorrectly billed $9,167 to taxpayers in Thornton Township, where she is supervisor. Weideman revealed that this isn't the first time Henyard's …