In 2003, the U.S. Supreme Court upheld the legality of affirmative action in college admissions. But the political controversy surrounding affirmative action, and the limits placed on its use by the Supreme Court as well as by various state entities, has had a major impact on graduate education, according to a report released Wednesday. According to the report, from the Woodrow Wilson National Fellowship Foundation, many of the groups that support minority Ph.D. students have broadened their programs to include other students as well. As a result, the report warns that the cohort of new Ph.D.’s — and in turn...