A privately informed sender may influence the decision maker through an intermediary who is better informed than him. I assume that the objective sender and intermediary pass on their best information, while the biased ones prefer a particular action but also have reputational concerns. I show...

A candidate for political office has private information about his and his rival's qualifications. A more informative positive (negative) campaign generates a more accurate public signal about his own (his rival's) qualifications, but costs more. A high type candidate has a comparative advantage...