Bendor, Jonathan, and John G. Bullock (2008) “Lethal Incompetence: Voters, Officials, and Systems.” Critical Review 20(1-2):1-24. DOI: http://dx.doi.org/10.1017/S0003055411000116
The study of voter competence has made significant contributions to our understanding of politics, but at this point there are diminishing returns to the endeavor. There is little reason, in theory or in practice, to expect voter competence to improve dramatically enough to make much of a difference, but there is reason to think that officials' competence can vary enough to make large differences. To understand variations in government performance, therefore, we would do better to focus on the abilities and performance of officials, not ordinary citizens.
Link to article here.