This meme is intended to illustrate the point that he knows nothing about the Lincoln presidency, so as not to appear ignorant of history, he attempts to obfuscate his questioner by employing the tactic of making a generalized statement about Lincoln’s intelligence to avoid any specific knowledge of the Lincoln Presidency. All of us understand that Lincoln was a genius, but what was Lincoln’s success? Trump has no idea. This is like Barney Fife explaining the Emancipation Proclamation. Andy Griffith Show, Season 3, Episode 23. Trump’s double-talk. It also illustrates the fact that he is uncomfortable mentioning the granting of freedom to the slaves, which anyone with any experience of elementary school, should know by heart.