""" "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."...
The black philosopher's idea was that a man is not independent, and cannot afford views which might interfere with his bread and butter. If he would prosper, he must train with the majority; in matters of large moment, like politics and religion, he must think and feel with the bulk of his neighbors, or suffer damage in his social standing and in his business prosperities."""
This billionaire's opinion of wealth inequality, his own part in it, and the straw men he battles are the very essence of corn-pone based thinking that Twain is speaking to.
Graham's (toxic and highly biased) opinion about wealth inequality is a condition of how he gets his corn-pone every day. To him, however, this corn-pone opinion becomes the very essence of rational thinking amongst himself and his peers (like Marc Andreesen and his periodic twitterisms).