Journals are a great place to start doing research.
The quarterly journal of the American Political Science Association, the preeminent group of American political scientists. APSR Online features an index of articles going back to 1994, online abstracts of those articles, book reviews and links. The website includes access to abstracts on articles of general interest, essays, and a workshop section on new developments in research methodology. Again, no online articles. Unlike the other journals, Foreign Affairs is published not by a university or an association, but by the Council on Foreign Relations, a nonprofit, nonpartisan research and national membership organization dedicated to promoting improved understanding of international affairs and to contributing ideas to U.S. foreign policy.