Explain caste in politics

We know that caste is a closed group. The powerful upper castes have the access to all property and all power while the lower castes are devoid are all rights.This contradiction sows the seed for the caste based politics. While the upper castes uses politics to keeps its societal hierarchy intact by grabbing the highest political seats. The lower castes uses politics to win back the their rights that they have been devoid of. And so caste and politics becomes almost inseparable.