I mean NOBODY knew, not even Lincoln himself. I still don’t believe it.
Consider the evidence:
Beards: Karl Marx, Lenin, Lincoln
No beards: Reagan, Quayle, Nixon
It’s obvious – Abe was a commie!
Plus, his sobriquet was “Honest” Abe. That doesn’t sound very Republican to me. I never heard Stone and Trump called Honest Rog and Honest Don.