This paper reflects on the experience of the 1999-2002 minority pipeline program (MPP) at the University of California, Riverside. With support from the American Economic Association, the MPP identified students of color interested in economics, let them explore economic issues affecting minority communities, and encouraged them to consider postgraduate work in economics. The MPP's successes and failures can be traced to the shifting balance in California's racialized political economy, especially a state ballot initiative forbidding the use of applicant race or ethnicity in University of California admission decisions, and to the transformation of economics itself, especially at the level of doctoral training. The MPP experience may be of relevance for other efforts to increase racial/ethnic diversity in social science disciplines. [This paper originated as a presentation at the University of Leeds' 2013 Annual Black History Month Conference, "Building the Antiracist University: Next Steps," which was sponsored by the University's Center for Ethnicity and Racism Studies (CERS) on October 18, 2013.]