Brennan as 'Jesse Jackson'

Yeah, it's under the Trivia section on his Internet Movie Database entry which I copied and pasted below. Terrible! 

During the 1960s he was convinced that the anti-war and civil rights movements were being run by overseas Communists, and said as much in interviews. He told reporters that he believed the civil rights movement in particular, and the riots in places like Watts and Newark and demonstrations in Birmingham, Alabama, were the result of perfectly content "Negroes" being stirred up by a handful of "troublemakers" with an anti-American agenda. Those on the set of his last series, The Guns of Will Sonnett (1967)--in which he played the surprisingly complex role of an ex-army scout trying to undo the damage caused by his being a mostly absentee father--said that he cackled with delight upon learning of the assassinations of Martin Luther King and Robert F. Kennedy in 1968, and several crew members recalled how he actually danced a spontaneous jig when he heard of King's murder.

The character name is not ironic; it's a coincidence.