The most useful resource I have found, and the one that inspired my research project, is the Internet Archives TV commercials. The first ad I found was a 1960 Kennedy for President ad that showed cartoon figures holding Kennedy signs and singing about why you should vote for him. The entire thing was the most upbeat and happy political ad I had ever seen. Looking to the 1964 ads, everything dramatically switched tone. Instead of songs, every other ad showed a nuclear detonation or heavy warfare in Vietnam. The dramatic shift made me think, did America really become so much more pessimistic in four years? Could you chart political ads against prevailing American attitudes? These TV ads were so completely different they demonstrated the shift perfectly, and have become a benchmark for the rest of my project and for analyzing the prevailing public attitudes of the time.