There are a lot of majors you can select for that - political science, communications, English, public relations. Most colleges offer political science and English.
Syracuse is pretty well-known for their communications-related programs - they have a major in communication and rhetorical studies as well as one in public relations. Penn is also really well known for its communication school and has a major in communication. American has communications and a major called public relations & strategic communications; they also have a variety of political and policy-related majors and are located in DC. Boston University has a College of Communication, and they have a major in communications with a specialization in public relations.
Other colleges to check out are Emerson (a small liberal arts college focused on communications), Fordham, Northeastern, NYU (in Steinhardt), Rochester Institute of Technology, SUNY New Paltz, Oswego, and Fredonia, the University of Vermont, and Marymount Manhattan.
But…keep an open mind. I cycled through a lot of interests when I was in high school and early in college - most people change their minds a couple of times. And even my husband, who had wanted to be an aerospace engineer and astronaut since he was three years old, changed his mind mid-college and changed his major to math and then to statistics later. So don’t get too married to the idea of anything too specific yet, either major-wise or college-wise. And select a college not just for the major but because of the wide range of opportunities they offer. Syracuse, Penn, BU and American are all great choices for a variety of reasons - and they all have a wide range of majors to choose from (as do Fordham, Northeastern, RIT, the SUNYs and Vermont).