In the last few years several research labs have been created to promote the study of race & ethnic politics (REP). They differ in the type of resources they provide their members, but share a common goal of promoting mentorship to junior scholars through collaboration.
This is a listing of the ones I am aware of, but is not exhaustive. In addition to the below, I know that Michigan State University and the University of Maryland have REP labs, but they don't have websites.
The Gender, Race, and Ethnicity Politics (GREP) Lab at Georgetown University
The Lab on Politics, Race & Experimental Methods at Princeton University