Explain how the arts impacted movements for social and political change in the antebellum era

Referring to anti-Buchanan political cartoon from the 1856 election.
The artworks created a perfect depiction on how the government officials in the southern states are controlled by plantation owners who utilize slavery to create economic growth in the south. This art managed to crate many opposition for James Buchanan which led to his failure to be re-elected on the following presidential term.

One key element is humour! the man probably represents a politician or worker!