A key way to understanding the influence and position of different factions within the Democratic Caucus and Republican Conference in the House of Representatives is to study the major ideologically-based caucuses that almost all members join. Tracking caucuses’ members within the institution is hampered, however, by the lack of membership information in data provided by the House. Although most caucuses publish their rosters on their websites, the absence of that information in available structured member biographical data makes using it in congressional research laborious.