This article introduces, describes, and evaluates a program designed to broaden the PhD pipeline in political science to achieve greater equity and inclusion. In its fifth year, the program brings undergraduate students from two Historically Black Colleges and Universities to an R-1 political science PhD department for a seven-week summer program, in which they are paired with a faculty mentor to conduct research for, prepare, and present an original research project. Additionally, participants attend methods classes, GRE preparatory workshops, subfield presentations from graduate students and faculty in the host department, and social events. We describe key lessons drawn from our experience in piloting this program. We evaluate its success using data about the composition of the host institution’s PhD program and exit surveys conducted with all participants from 2016 to 2018.