GovInfo.gov
Comprehensive database of US federal publications from the last 15 years, including legislation, directories, court opinions, etc. This is where you can find all kinds of Congressional Records, the Supreme Court Decisions, the U.S. Budget, and much more.
Oregon Blue Book
The "Official State Fact Book about all levels of government in Oregon." Describes the duties of all state agencies, offices, etc.; provides links to Legislation; etc. Current info is online. For old facts (like, what committees existed in 1972, etc.) we have old printed Blue Books in the library. Similar sources exist for other U.S. states.
United States Government Manual
Official handbook describes the function, structure, etc. of the parts of the federal government, such as the Department of Education, the U.S. Court of Appeals, etc.
World Factbook
Authoritative statistics about countries around the world, compiled by the CIA. "Provides information on the history, people, government, economy, energy, geography, communications, transportation, military, and transnational issues for 267 world entities."
News Reports
Google News Search
Good for finding recent news; not so good for anything more than a year or two old.
Primary Sources Guide: Newspapers & Magazines
This guide links to a large number of sources for doing historical newspaper research. This is best used if you are looking for historical news pieces.
Population, Economy & Health Statistics
U.S. Census Data
Use the tools here to find population data, broken down by age, gender, race, socio-economic status, etc. from the federal level down to a specific zip code.
U.S. Bureau of Labor Statistics
Includes facts about employment, joblessness, average wages broken down by region, and more.
County Health Rankings
Includes reports ranking each US county. This site provides facts such as the percentage of people in each county who suffer from poor physical activity, long commutes, "severe housing problems," unemployment, etc.
CDC Fast Facts
The Centers for Disease Control's "Fast Facts" site has statistics on a large range of public health issues, including statistics related to specific age groups (children, older people, etc.), Suicide rates (see under "Injuries"), etc.
Statistical Abstract of the United States (1889-2011)
This was an annual publication that compiled key facts about the U.S. population, economy, etc. each year. This is a great source to look at if you want to show how something like income or demographics changed over time.
Crime, Policing, etc. Statistics
Bureau of Justice Statistics (BJS)
Federal corrections, crime, and court statistics collected by U.S. government bodies. Includes a lot of information about prison/jail populations.
Campus Security & Safety Statistics
Statistics related to university/college campus crime and safety. You can look up reported data for specific schools, including Pacific University.
Criminal Justice Information Services (CJIS)
Includes four sets of government-compiled data: "The National Incident-Based Reporting System (NIBRS), the Summary Reporting System (SRS), the Law Enforcement Officers Killed and Assaulted (LEOKA) Program, and the Hate Crime Statistics Program."
"Mapping Police Violence"
A site using crowdsourced data to document/map killings by police. See the "about" section for more info on their data.
Check the "References" Section under your topic in Wikipedia
Wikipedia is a great way to get an overview of the broad issues on a political topic. However, because anyone can edit it, it can be seen as unreliable or biased. It's better to use Wikipedia as a preliminary discovery tool, and then dive into the sources that are cited within it for your actual research. Look at the bottom of the Wikipedia page for "References"; see if you can get to the original sources.
Sample: Wikipedia page on Homelessness in the United States: References Section