This site, "records, indexes, and archives all C-SPAN programming for historical, educational, research, and archival uses." Every C-SPAN program aired since 1987, totaling over 160,000 hours, is available and accessible at this site developed and maintained by the C-SPAN Archives.
This online archive presents the video advertising for the Democratic and Republican (and significant third parties, when applicable) presidential candidates of the television era from 1952 to the present.
Includes annual democracy reports,country reports, thematic reports, and a variety of analysis tools, including interactive maps and motion charts. This site also has datasets which include data for 201 countries and extend from 1789 - 2017.