James Brown had nothing to do with those guys, he was fairly conservative in real life.
Sharpton worked for Brown in the 1980s. Cornell is a wannabe Marxist who resents capitalism.
The Black Panthers were against James Brown because he was a capitalist.
James saw nothing wrong with capitalism. He was a hard working man, a self-made man, and wanted to benefit from the rewards of his hard work.
He may have endorsed Humphrey, by he played the Nixon inauguration in 1969.