Is there any national politician in America, who, when asked about 'the greatest philosopher', would not respond: Jesus?
The poor second speculated upon, but never actually chosen, is Socrates.
Never, ever, would we hear Plato or Nietzsche, the two poets among the philosophers, who also have uncomfortably undemocratic associations, anachronistically linked to 20th Century fascism. Such bad reps are cruisin' for a bruisin', just asking for a 'swift boat' attack.
Marx? Well, more a 'political economist', but, of course, a communist. Machiavelli? Half the same charge -- political theoretician -- and in addition, strictly an opportunist, a schemer.
Voltaire? Way too clever, too anti-Establishment, vehemently anti-clerical -- a debunker of religions.
Sartre? Double-breasted, film noir version of Voltaire plus Marx.
Forget any 'technical philosophy': Descartes, Hume, Whitehead, Wittgenstein, Ayer.