In the scene between Eddie Murphy and Charles S. Dutton eating crab they are eating Dungeoness crab, which is found only on the west coast. Washington DC, Baltimore is known for their blue crab - an entirely different species typically eaten exactly the same way shown in the film. Dungeoness crab are not.
Johnson quotes several Presidents of the Untied States during his run for Congressman speech. "We have nothing to fear but fear itself" Franklin D. Roosevelt "Ask not what your country can do for you, ask what you can do for your country" John F. Kennedy "Read My Lips", George W. Bush