I think they were thinking of Carlos Menem's "si hubiera dicho lo que iba a hacer, no me votaba nadie” , but AFAIK thats a misquote [1]
A more recent Argentinian president (Mauricio Macri) said a similar thing though: " If I had told them everything I was going to do, they would have voted to lock me up in an asylum" (Tl mine).
Original [2]: "Si les decía todo lo que iba a hacer, votaban por encerrarme en el manicomio"