Studies of electoral politics did not pay attention to the role of candidates until late 1970s. Since then, how ever many empirical studies support that candidates play important role on affecting people's vote choice. This study employs data from the 2004 Taiwan Election and Democratization Study, we demonstrate that candidates' factors, such as personal characters, competence, and prospective evaluation play important role on citizens' vote choices. In the other hand, for employing more parsimonious model to predict voters' choices, we find if one wants to employ only evaluation of candidates to make forecasting of presidential elections, 20 items to measure candidates' competence is a good alternative. However, feeling thermometer, along with demographic backgrounds, party identification, preference on independence versus unification with China, and Taiwanese identity, make relative better prediction on the 2004 presidential elections.