Immigration is an important election issue that often benefits right-wing political parties. Contemporary European politics is an example par excellence. Immigration in the US has been intermittently at the fringes and centre-stage in recent years, and this column looks at the extent to which US voters care about immigration. The political effect of immigration turns out to crucially depend on the extent to which immigrants participate in the political process. One thing from the research is clear: Republicans are generally opposed to immigration reforms, especially if they include a path to citizenship for currently undocumented immigrants. Naturalised immigrants are a liability for conservative politicians, as they tend to vote for progressive parties.