David E. Campbell, John C. Green, and Geoffrey C. Layman. 2011. “The Party Faithful: Partisan Images, Candidate Religion, and the Electoral Impact of Party Identification.” American Journal of Political Science 55 (1): 42-58.
David E. Campbell. 2009. “Civic Engagement and Education: An Empirical Test of The Sorting Model.” American Journal of Political Science53(4): 771-786.