The so-called revolving door between employment in government and industry is especially relevant to the U.S. Congress because ex-legislators are notorious for taking jobs as lobbyists. There are two prominent explanations for why they do so: Lobbying either matches the talents of former legislators due to their specialized congressional training or it represents customary ex-post payments for ex-ante legislative assistance to special interests. This article explores the former dynamic, focusing on how specialized training impacts occupational outcomes of legislators and finds strong evidence to support the notion that former legislators become lobbyists due to unique human capital. This finding somewhat qualifies the notion that possible ex-post payments are a main driver for the postelective employment choices of ex-legislators.