Can Political Science majors become journalist/writers?

I am currently a Poli Sci, Psychology major with a minor in Biology. I am considering many career paths such as neuroscience, journalism, law-school, med-school and business. I am committed to grad-school to obtain one of the following: MS, MA, MBA, J.D., Ph.D or M.D. I almost went to Northwestern University right out of high school but went elsewhere, however I was thinking of going to NU Medill graduate school of journalism.