A drunk driver who crashed into a utility pole leaving his passenger critically injured will serve a half-year behind bars.The drunk driver, Richard A. Borum Jr., 68, entered guilty pleas before Circuit Court Judge Bart Stanley to charges of vehicular assault, reckless endangerment and second-offense driving on a revoked license. He was directed to serve 180 days of a three-year sentence, perform 64 hours public service work and lose his driver license for one year.His jail time comes for a wreck that happened just before Christmas on Francis Ferry Road. Investigators say Borum was driving a 1990 Cadillac when he lost control causing it to run onto the shoulder of the northbound lane.