The summary of the films conclusion on wikipedia is gold:

Black Dynamite then travels to the White House (in the process, Cream Corn is killed by the Secret Service) and confronts President Richard Nixon, who has been giving the orders from the beginning. Black Dynamite engages Nixon in a kung-fu battle. Nixon gets the upper hand when he dishonestly pulls John Wilkes Booth's gun, but the ghost of Abraham Lincoln appears and disarms Nixon with kung-fu. After defeating Nixon in a fair fight, Black Dynamite threatens to expose Nixon as the subject of a series of bondage and cross-dressing photographs. The president begs to be killed but Black Dynamite refuses to give him "the easy way out" and has Nixon watch out for his people. The film concludes with a monologue from Black Dynamite on his quest for justice as Gloria and Pat Nixon watch on rapturously.