Sure, but Arnie is a naturalized citizen, and he can't be President. The other two are natural-born citizens and can.
Barack was born a citizen of the United States and a citizen of the United Kingdom.
Sure. So what? Dual citizenship is not a bar to the Presidency under the Constitution or under US law.
No, Arnie is not a ‘naturalized citizen’. He is a citizen of the United States BECAUSE he was naturalized.
Please read the 14th Amendment. It does not define NATURALIZED citizens. It defines CITIZENS of the United States.
Section 1. All persons born OR naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside.
This means all persons BORN in the US and subject to the jurisdiction thereof (Obama, Wong Kim Ark,)
AND
This means all persons NATURALIZED in the US and subject to the jurisdiction thereof (Arnold)
The Constitution recognizes TWO types of Citizens:
(1) Natural born citizens of the United States (President)
(2) Citizens of the United States (Not President)