Hello aspirant,
You have a really good intention.
Yes, you can do post graduation in political science.

M.A. in Politics is a Post Graduate course in politics and related study. The course is divided into four semesters spanning over 2-year duration during which students are taught about subject specialization.
A Post Graduate in a Political study can have a variety of options to choose from in terms of his/her career. He/she can make a career as Journalist, Political Scientist, Civil Servant, Campaign organizer etc.
All the best for your successful career.