"All right, then you should convince me that vilifying billionaires is not part of leftwing politicians schtick. "

I should do your work for you? Hmm. Interesting take. Also, asking to show a negative is pretty impossible eh? So I will start with the big ones. Bill Clinton, Al Gore, John Kerry, Barack Obama, Hilary Clinton, Joe Biden, Kamala Haris. All at least somewhat progressive politicians, none vilifies billionaires.

Of course you must recognize that a politician pointing out that the playing field is tilted in favor of billionaires isn't vilifying billionaires although some lazy thinkers like to pretend it is the same because it is easier to dismiss their arguments.

"And notice that the assignment concerns leftwing politicians, not leftwing businessmen."

JB Pritzker says hi.

Also, when Buffett and Gates make their progressive comments they are making political comments, not business comments.

Are Rachel Maddow and Sean Hannity considered politicians or businesspeople? They have never run for any office, but most people would consider their endeavors to be political.