Concerns about the influence interest groups wield on policy-making has voters, activists and pundits alike demand more transparency vis-a-vis both policy-making and lobbying per se. I consider under which conditions and through which mechanisms lobbying transparency can benefit voters. When politicians' career and policy concerns align (high policy transparency) lobbying transparency requirements have no bite. When politicians' motives clash and generate pandering incentives, lobbying transparency help voters induce better policy-making as well as possibly improve the selection of politicians via elections. Rather than improving the quality of influence, lobbying transparency helps voters either (i) better discipline their politicians, by reducing pandering or (ii) ensure more information transmission from special interest groups. The effect of policy transparency is highly non-monotonic and dependent on lobbying transparency. Conditional on appropriate lobbying transparency standards, more policy transparency may backfire by facilitating the persuasion of elected officials.