The most common mascot symbol for the party has been jackass or the donkey.
Andrew Jackson's enemies twisted his name to "jackass" as a term of ridicule regarding a stupid and stubborn animal. However the Democrats liked the common-man implications and picked it up too, so the image persisted and evolved. Its most lasting impression came from the cartoons of Thomas Nast 1870 in Harper's Weekly. Cartoonists followed Nast and used the donkey to represent the Democrats, and the elephant to represent the Republicans.