A cartoon in Harper's Weekly uses the donkey to symbolize the Democratic Party for the first time - January 15th, 1870

This Day in History Class - A podcast by iHeartPodcasts and HowStuffWorks

On this day in 1870, political cartoonist Thomas Nast first used the donkey as a symbol for the Democratic Party in a cartoon titled “A Live Jackass Kicking a Dead Lion."

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