"Disclosure laws for politicians exist in over a hundred countries. But can disclosures about politician performance and qualifications influence electoral accountability in settings characterized by weak institutions and less educated populations? In the run-up to elections in Delhi we implemented a field experiment where we provided slum dwellers with newspapers containing report cards with information on candidate qualifications and legislator performance obtained under India’s disclosure laws. We observe striking changes along three dimensions. Access to report cards increased voter turnout, reduced the incidence of cash-based vote buying and caused electoral gains for better performing incumbents. The turnout effects are more pronounced in more competitive jurisdictions and when the incumbent is a worse performer. We also observe significant voter sophistication – voters make comparisons across candidates to overcome political agency problems and reward better performing incumbents." (Abstract)