Whatever "manner" he had in public, Lincoln was probably the best writer that has ever held the office, with a towering intellect. If you knew ANYTHING about real history, you would know this too.
Sarah Palin didn't write those jokes, Leno's staff did. She just read them off the teleprompter - isn't that ironic?
Are you basing this on some inside knowledge or are you just talking out of your...uh...hat?
Sorry, but the Best Writer/Towering Intellect Award goes to Thomas Jefferson.