My short answer is there is no such party now because the CCP does not allow other parties to exist. Once the other political parties start to emerge, the CCP will likely shrinkly rapidly as a lot of its members join other parties that can better represent their values, so we will have a few significant parties competing for power in a short period of time. The same process happened in Russia, East Europe, Taiwan, South Korea, and all over the world as they moved from tyranny to democracy. Earlier this year Wen Jia Bao said the goal is to move China towards a democratic nation that respects human rights and freedom. Let's hope he is sincere and the process of this political change will be calm and peaceful in China