“…Beginning with the introduction of the wellknown NOMINATE procedure to measure legislator ideology with roll-call votes (Poole and Rosenthal, 1985;Poole, 2005), the literature has since greatly advanced these measurement techniques, expanding them into new areas of theoretical and empirical interest. Methods have been developed to measure the ideology of legislators (Poole and Rosenthal, 1985;Heckman and Snyder Jr., 1997;Clinton, Jackman and Rivers, 2004), political donors (Bonica, 2013(Bonica, , 2014(Bonica, , 2018, interest groups (Groseclose, Levitt and Snyder Jr., 1999;McKay, 2008;Crosson, Furnas and Lorenz, Forthcoming), Supreme and lower-court justices (Martin and Quinn, 2002;Jessee and Malhotra, 2013;Bonica and Woodruff, 2015;Bonica and Sen, 2017), newspapers (Groseclose and Milyo, 2005;Ho and Quinn, 2008;Shapiro, 2010, 2011), municipalities (Tausanovitch and Warshaw, 2014), and government agencies (Richardson, Clinton and Lewis, 2018). Substantial effort has also been put into measuring the ideology of ordinary citizens and political actors on a common ideological scale (Aldrich and McKelvey, 1977;Jessee, 2009;Bafumi and Herron, 2010;Bonica, 2013Bonica, , 2014Jessee and Malhotra, 2013;Hare et al, 2015;Jessee, 2016).…”