In this article, we test the effects of interest group endorsements on potential voters in the 2008 presidential election. Specifically, we use a posttest-only, multiple control group experiment (N = 701) to examine how real-world endorsements affect citizens. We find that endorsements have profound effects on some voters. Specifically, we find that interest-group endorsements profoundly affect the candidate evaluations and stated voting preferences of potential voters who are what we call ‘poorly aligned’ – that is, whose stand on the issue on which the endorsement is based (in this case, abortion) does not align ‘properly’ with their party identification and ideology. Moreover, we find that the effects of endorsements are most profound among poorly aligned voters who are not well informed. In all, our results confirm that interest-group endorsements indeed act as cues for voters, even in high-information elections.