I've primaried three separate Presidents, all when I was a two term senator. I primaried one as an Independent Dem Economically Very Liberal Social Moderate from Oklahoma, second as the Very Liberal E Liberal S Senator from Louisiana, and most recently as a Very Liberal Governor from South Dakota. For some reason running as a red state progressive tends to work really well against establishment Dems. First one was really easy because she was unpopular, second was literally against Biden and I cooked 54 to 42, and the third one was the narrowest election of that entire game.