This chapter provides an introduction to the meaning of issue intensity and frustrated majorities through review of the existing theory and evidence of political science. I suggest that while theories of trade politics, bureacracy, legislative behavior, and political parties have explicitly or implicitly considered the consequences of varying issue intensity, the political science of elections has given it short attention. I show how the political science of the electoral connection complicates many existing explanations for frustrated majorities and suggest that adding issue intensity to the electoral connection provides an improved explanation.