“…The reason is simple: Political professionals almost uniformly believe that negative campaigning is effective (Mattes and Redlawsk 2014, 30), if not all of the time then at least under certain circumstances. While there is no shortage of anecdotal evidence to suggest that they are correct, academic studies have yielded mixed results regarding the persuasive effects of campaign ads generally (Fowler, Franz, and Ridout 2016), and of negative advertising or other forms of negative campaigning in particular (Geer 2006 It seems likely that the inconsistent findings of this literature are due at least in part to the fact that negativity lies in the eye of the beholder, that is, "whether a tactic, a candidate, or a campaign is [perceived as] negative depends on whose ox is being gored" (Sigelman and Kugler 2003, 144; also see Lipsitz and Geer 2017). The fact that self-identified partisans react differently to attacks coming from the other side than they do to criticism by candidates of their own party should therefore come as no surprise (Ansolabehere and Iyengar 1995;Stevens et al 2015).…”