Ballotpedia
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Nonpartisan online encyclopedia of American politics covering federal, state, and local offices, ballot measures, court rulings, and election results. Readers can look up any officeholder or candidate and trace how a specific election or measure was decided.
More resources on American Government
congress.gov
Congress.gov is the official portal for United States Congress, offering up-to-date and historical legislative information. You can find bill texts and summaries, status and amendments, committee reports, roll-call votes, member and committee profiles, and searchable records from the Congressional Record.
oyez.org
Oyez is a multimedia archive of U.S. Supreme Court cases. It provides official audio of opinions, full text opinions, case summaries, transcripts, and background on justices and landmark rulings—an essential resource for learning constitutional law basics.
GovTrack.us
Independent legislative tracker covering bills, roll-call votes, and members of Congress. Users can follow a bill's progress through committee and floor stages, compare voting records across legislators, and read plain-language summaries of pending federal legislation.
The Constitution, the Articles, and Federalism: Crash Course US History #8
Intro to US policy-making process by John Green, highly recommended in r/PoliticalScience
American Government
Learn the fundamentals of American government and prepare for college credit. Study key concepts, history, and institutions!
American Government
Learn US government and public policy through engaging videos and practice exercises! Free course from Khan Academy.