Hii!
Yes, it is possible and allowed to do graduation again If you want and with the same ourse too, as long as you satisfy the respective Eligibility criteria. But, you should know that this will waste  three years of your career and also, the previous graduation certificate will not be valid.
BSc political science has good career scope in future. Its better If you go on with this and do not repeate agin with honors. But at last,  it's your choice. Decide wisely.
Hope you understand.
Good luck!