Why did the cartoonist use a snail to represent congress?

A congress is a formal meeting of the representatives of different nations, constituent states, independent organizations (such as trade unions), or groups.[1]

The term was chosen for the Continental Congress to emphasize the status of each colony represented there as a self-governing unit. Subsequent to the use of congress by the U. S. legislature, the term has been adopted by many states within unions, and by unitary nation-states in the Americas, to refer to their legislatures.

the cartoonist represent it as snail because they are too slow in doing their job