Math/Political Science double major or Math/Econ?

[alaink]

I am interested in going into law school or graduate studies in political science. (My interest in political science is more than being "interested in politics;" I know what I'd be getting into.) So for my undergrad I am considering a math major with a stats concentration (or a stats major if my school offers it) with political science.

 

However, I'm afraid that if something well out of my control happens and I can't attend law or graduate school for any reason, I'm stuck with a poli sci undergrad. So would math/econ be better, just in case I need the backup? The only issue I have with doing economics is that I know I would be able to excel in political science. 

 

Any advice would be greatly appreciated.