Because Maximum politician are currupt. Maximum politician are not surving to the people of nation. Maximum politician are now from zero to multimilion in just winning in one election from corporator to MAL or MP or minister. Maximum politician are taking special prevalage over then LAW. The convection rate for politician is negligible then the ordinary person in india, because the law implecation agencies are differ for different peoples poor or rich. In last in my view for the president post, the person should be scientist, economist, professor, defence personal like as Dr. Abdul Kalam as current president.