In this study, we investigate whether the expansion of healthcare investments in Brazil, implemented through the Family Health Program (FHP), increased incumbent voting in local elections. We employ a regression discontinuity design by exploring discontinuities in funding that created a quasi-experimental assignment of FHP resources to municipalities. Using administrative data from various sources, we obtain information on program implementation, health outcomes, local-level facilities, and indicators of access, covering several aspects of the Brazilian health system to understand the evolution of underlying health conditions throughout this period. We provide evidence that FHP investments had significant effects on electoral support. Results show that for a 50 percent increment in FHP annual transfers, the incumbent s vote share increases by roughly 9 pp. We also show that possible mechanisms for these electoral effects were better access to primary care and consequent improved outcomes at birth. Overall, this paper contributes to a better understanding of the substantial changes the Brazilian health system has undergone and its potential electoral effects, opening many possibilities for future research.