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ÏÀʸ³µÍס§This paper develops a political-competition model in which platforms are¡¡partially binding: a candidate who implements a policy different from his or her platform must pay a cost of betrayal that increases with the size of the discrepancy. I also suppose that voters are uncertain about candidate preferences for policies. If voters believe that a candidate is likely to be extreme, there exists a semi-separating equilibrium: an extreme candidate mimics a moderate candidate with some probability, and with the remaining probability, he announces a platform which commits to a more moderate policy to be implemented. Although an extreme candidate will implement a more extreme policy than a moderate candidate in equilibrium, partial pooling ensures that voters prefer an extreme candidate who does not pretend to be moderate over an uncertain candidate announcing a moderate candidate's platform. As a result, a moderate candidate never has a higher probability of winning than an extreme one.

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