Comment: He was, but his parents were not

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In reply to comment: Didn't Think Rubio was Eligible (see in situ)

He was, but his parents were not

Rubio was born in Miami, Florida,[5] the second son and third child of Mario Rubio and Oria Garcia. His parents were Cubans who had immigrated to the United States in 1956 and were naturalized as U.S. citizens in 1975.[6]
http://en.wikipedia.org/wiki/Marco_Rubio#Early_life.2C_educa...