Actually, there's no evidence that he did say it, despite many attributions that can be found on the internet. (Similar attributions can be found to Andrew Jackson, based on a claim made by Robert Kennedy, but again I can't find that quote in any of Jackson's writings, either.)
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it wasn't a president. it was King.
The President that first said all men are created equal was Thomas Jefferson. He was the third president of the United States.
Reagan
The President is sworn in by the Chief Justice of the Supreme Court.
Abraham Lincoln supposedly said it.