Political campaigns discuss the personal dimensions of their candidates with great frequency, but scholars of campaign message strategy have not addressed why and how campaigns do so. This project focuses on the use of biographical appeals in campaign advertisements. Employing a dataset of candidate-sponsored campaign advertisements in the 2004 House and Senate general election, we argue that campaigns use these appeals in an effort to develop and enhance the credibility and likeability of their candidate in the face of voter skepticism about politicians and political messages. We find that campaigns employ more appeals on biography than on any substantive issue and highlight certain aspects of their biographies, like family values, more than others. We also find that challenging campaigns are more likely to discuss their candidates biography, but, surprisingly, that open seat campaigns are not. Our results demonstrate the importance of personal-based appeals to campaign strategy and that campaigns balance these personal and substantive concerns in developing their appeals to voters.