And they were wrong.
Then there is the case of Trump, whose mother was born in Scotland and whose father was a native of New York. As with Arthur and Obama, one of his parents was not a natural born citizen of the United States. Irrespective of original intent of the Framers, if there is over a century of precedent of ignoring it, it is unlikely to be recognized by the Federal courts. I am sure the Democrats would have considered this angle of attack against Trump, as they are grasping at any straw, but for the fact that he is in the same category as Obama.