“…Despite parties' broad use of different communication channels, scholars have traditionally relied on single campaign channels to assess parties' issue emphasis strategies (for exceptions, see Norris et al 1999;Green and Hobolt, 2008). In the United States, studies are generally based on political ads (e.g., Damore, 2004Damore, , 2005Kaplan et al, 2006;Sides, 2006;Sigelman and Buell, 2004;Spiliotes and Vavreck, 2002), whereas European studies typically rely on electoral manifestos (e.g., Brouard et al, 2012;Dolezal et al, 2014;Green-Pedersen and Mortensen, 2015;Spoon et al, 2014), or on press releases (Green and Hobolt, 2008;Hopmann et al, 2012;Meyer and Wagner, 2016). Whichever campaign channel is investigated, the underlying assumption is that each specific data source provides a representative view of the parties' issue priorities and that parties emphasize the same issues to a similar extent in all their campaign materials.…”