Lowery, DavidBaumgartner, Frank RBerkhout, JoostBerry, Jeffrey MHalpin, DarrenHojnacki, MarieKluver, HeikeKohler-Koch, BeateRichardson, JeremyLehman Schlozman, Kay2015-12-131350-1763http://hdl.handle.net/1885/70665Since political scientists were introduced to the concept of ‘the scope and bias of the pressure system’ by Schattschneider more than half a century ago, we have grappled with the lack of a standard against which to assess bias. Still, scholars have c201510.1080/13501763.2015.10491972015-12-11