I show that interest groups can achieve policy goals through voters by influencing public opinion. Special interests know the state of the world and have state-independent policy preferences. Voters use signals sent by special interests to form opinions about the appropriate policy. The altered public opinion creates electoral pressure, to which incumbents respond by making policy concessions from their ideal policies. The known bias of special interests constrains their ability to persuade voters, but the possibility that sufficiently misaligned incumbents may be electorally aided by moderate public opinion incentivizes special interests to exaggerate the state of the world in the direction of their bias. The strategic exaggeration and the resulting policy distortion increase with the extremism of the special interest. Interest groups' strategic manipulation of public opinion improves electoral accountability with moderate incumbents but worsens accountability when incumbents are extremist.