This article develops a model of forming non-response in consecutive polls when there is uncertainty about candidate's character due to a scandal event. The first section provides a theoretical clarification on the intentions and effects of campaigning and shows that both uncertainty reduction and expectation are indispensable for individual voters to reveal their preferences. In this way, polling is an efficient tool to send signals and make noise during campaigning. The data analysis suggests that the scandals do have an effect and that candidate James Soong suffers from the increasing number of non-response voters.