The U.S. attorney's office in Chicago has filed bribery and tax charges against a former Illinois state senator and longtime chairman of the powerful transportation committee.  A two-page filing in U.S. District Court Monday says the allegations relate to former State Sen. Martin Sandoval's support for the installation of red-light cameras. It says the Chicago Democrat “corruptly solicited, demanded, agreed to accept and accepted” payments for “continued support for the operation of red-light cameras in the State of Illinois." Agents raided Sandoval's office in Springfield, his office in Chicago and his home on Sept. 24 amid still-active federal investigations of public corruption that have ensnared multiple Democrats.