This paper estimates the effects of large donors’ political contributions on charitable contributions and fundraising. Political contributions reduce the effectiveness of charitable fundraising, particularly in the Health and Other sectors. Charities therefore reduce fundraising, which contributes to an overall elasticity of private charitable contributions to political contributions of -0.07. This aggregate effect combines large political donors’ charitable contribution behavior with spillover effects of their political giving on the charitable giving patterns of the remainder of the population. Subsequent analysis allows for heterogeneity in the ideologies of both political and charitable recipients.