“…Partisanship remains one of the most studied subjects in political science. From the early days of The American Voter (Campbell et al., 1960) until the present, scholars have studied the origin (Brader & Tucker, 2001; Converse, 1969; Cassel, 1993) and prevalence (Aldrich, 1995; Bartels, 2000) of partisanship, not to mention its dynamic (Fiorina, 1981; Franklin, 1984; Franklin & Jackson, 1983), cognitive (Gant & Luttbeg, 1987; Lodge & Hamill, 1986), and psychological (Greene, 1999) aspects. In this study, we contribute to this literature by looking into another—previously unexamined—“facet” of partisanship: partisan behavior in social dilemmas other than voting and elections.…”