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Since the New Deal, labor has been a key member of the Democratic coalition. As unions decline, their centrality to the Democratic Party has also diminished. At the same time, state variation in party preferences, party strength, and the types of unions that remain has led some unions to become involved in Republican politics. In this manuscript we investigate how central unions are in party networks using state legislative donation data from 2000–2016. We find that union contributions are associated with increasing centrality to the Democratic Party, while business interest contributions are associated with unions being less central. Only union membership rates are related to labor's position in the Republican network. This work has implications for how we consider which groups are under a party's umbrella. While labor may spend more money, it cannot keep pace with business groups in the party coalition. [ABSTRACT FROM AUTHOR]