No person except a natural born citizen, or a citizen of the United States, at the time of the adoption of this Constitution, shall be eligible to the office of President; neither shall any person be eligible to that office who shall not have attained to the age of thirty five years, and been fourteen Years a resident within the United States. (US Constition - Article II, Section 1, Clause 5)

Why in the world is the "natural born citizen" provision still in the Constitution? It's needlessly exclusionary, antidemocratic, and, as Slate.com puts it, "idiotic."