lawpolicy

I am definitely going to law student at William and Mary next year. I want to have a career in public policy. I am strongly considering getting an MPP from another school after graduation from law school. With my law degree will I need an MPP to get in the public policy arena? I was considering UMaryland or Georgetown part time while I work in public interest law in DC. I was also thinking of applying to Duke for their MPP program after my JD. My career goal is to have a job in the public policy arena, but do I really need a MPP to do so?