As a more general comment, I think you are doing things backwards: gearing your academics to the work world. If you have strong interests and abilities academically (in this case government and math), then follow them and then the appropriate work will follow. It would seem that economics is neither a strong interest nor a strength.
Have you done / are you doing any summer internships, or internships during the year? That can help a lot with clarifying career goals (and achieving them).
I know two young men who did consulting right out of college. They were both English majors. Granted, from Ivies. They worked for a couple of years as consultants and then left, actually.
I think you should take this time to focus on what you really want to study and what you are good at. You do not have to be so specific on career goals or match them exactly to course work. If you do well, you will do fine with getting good work. Meanwhile strengthen your prospects with real world experience like internships or even volunteering.