We analyze the impact of immigration on voting. Using Italian municipality data and IV estimation strategy, we find that immigration generates a sizable causal increase in votes for the centre-right coalition, which has a political platform less favorable to immigrants. Additional findings are: big cities behave differently, with no impact of immigration on electoral outcomes; gains in votes for the centre-right coalition correspond to loss of votes for the centre-left parties, a decrease in voter turnout, and a rise in protest votes; cultural diversity, competition in the labor market and for public services are the most relevant channels at work.