Although the Congress formally elects the Central Committee and Politburo, in practice these positions are negotiated before the congress, and the Congress has never functioned as a deliberative assembly. Nominees to Party positions are invariably elected by wide margins, with a tightly controlled candidate-to-position ratio. There is room for symbolic protest votes ("no" or "abstain" votes) that embarrass the party leadership. Despite its symbolic nature, it maintains an important role because it is the occasion at which the results of these deliberations are publicly announced, and in which the PRC leadership faces both domestic and foreign reporters in a press conference.