The term "bully pulpit" stems from President Theodore Roosevelt's reference to the White House as a "bully pulpit," meaning a terrific platform from which to persuasively advocate an agenda. Roosevelt often used the word "bully" as an adjective meaning superb/wonderful. The Bully Pulpit features news, reasoned discourse, opinion and some humor.
Leon and Jimmy wasted a lot of words in that article. They both could have just said, "I'm stupid" and left it at that. The meaning would have been identical.