[yonif]

"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. "

Doesn't that mean someone who has become American, can run for president?

[yonif]

Someone who has become an American citizen, fulfils that requirment.

[Founding Father]

No--they must be born ("natural") in the USA.

[Lunatic Fringe]

Or a citizen of the United States at the time of the adoption of this Constitution

This was put in because there were not a lot of natural born US citizens in 1787. But these days you must be a citizen of the US.

[Arthur McGowan]

The only naturalized citizen of the U.S. who is allowed to become President is someone who was naturalized BEFORE the date of the adoption of the Constitution.

[Dave S]

Doesn't that mean someone who has become American, can run for president?

What part of natural born do you not understand? The other part of the constitutional limit describes people who had been in the country for at least fourteen years by the time the constitution was passed. Believe that was around 1790. So if you werent here by 1776 when the declaration was written, you had to be born here. Arnold may be super man but he's not more than 200 years old.