DETROIT — General Motors Corp. is further broadening its multicultural marketing efforts and today announced that it will add Sanders\Wingo Advertising, Inc., to its list of advertising agencies to provide African American, urban and youth marketing support for Chevrolet, and Carol H. Williams Advertising to provide African American, urban and youth marketing support for Cadillac, HUMMER, Saab, Saturn and the GM Corporate brand, effective at the end of the first quarter of 2008.
