These databases are good starting places for Political Science research, and will be the most valuable for your research in this class. See the tab on "Journals & Journal Articles" for more Political Science databases when you get to the research design assignment.
See the "Statistics & Data" tab for more options and specific kinds of data sources like polling and elections data and more international sources. Don't forget to use the literature to identify appropriate sources of data, especially if you get stuck.
Before you start your research choose a citation manager that works best for you! It will help you keep citations to all your articles, sources and data in one place making things much easier when it's time to write your papers. EndNote Desktop software is available for free through ITS, and the more streamlined EndNote Basic is available for free on the web.
Congressional Research Service (CRS) Reports are non-partisan policy reports written for the use of Congress. They are a great way to get background on both domestic and foreign policy issues.