"The vast majority of Americans cannot afford this panacea from a Republican nominee who has denounced the progressive income tax as the invention of Karl Marx. I am afraid he has confused Karl Marx with Theodore Roosevelt -- that obscure Republican president who sought and fought for a tax system based on ability to pay. Theodore Roosevelt was not Karl Marx, and the Republican tax scheme is not tax reform."
January 1, 1970
https://en.wikiquote.org/wiki/Theodore_Roosevelt