GRAND RAPIDS, Mich. -- Her voice tired but her passion as strong as ever, Jennifer Gratz took the lectern in a recent debate here and talked about what she's been talking about for nearly a decade. "When we put an emphasis on race or sex through university admissions, through public employment, through policy, we teach people that it is OK to treat people differently," Gratz, 29, said as she debated this fall's Michigan referendum that would ban affirmative action in public education, hiring and contracting. Civil rights leaders said the vote will influence the affirmative action debate nationally. Gratz, a...