Interactive visualizations of how Americans voted in presidential elections from 1840-2008 down to the county level.

Election data including a complete 1787-present time series, state turn-out rates, voter demographics, and early voting data.

Voting and Election statistics back to the 1960s. Information from the US Census Bureau

Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping America and the world. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research.

Links to show how the electorate has changed over time. From American National Election Studies.

Analysis of public opinion polls.

A non-partisan public opinion polling organization.

Archive of presidential campaign commercials from 1952 - 2020 provided by the Museum of the Moving Image.

The non-profit, non-partisan arbitrating body that coordinates the presidential debate process provides information, transcripts, and video about presidential debates from many past elections.

This searchable database features ads of political importance that have appeared on Google and partner properties.

Analysis of political ads from national, state, and local campaigns. A project of the University of Maryland's Center for Political Communication and Civic Leadership