[mnehring]

If that isn’t a strech!!!!!

Not really. Rubio's parents were born in 1927 and 1931 in Cuba, however Cuba during that era, was a US Protectorate from 1901-1934 under the Platt Amendment.

http://www.americanforeignrelations.com/O-W/Protectorates-and-Spheres-of-Influence-U-s-protectorates-prior-to-world-war-ii.html#b#ixzz1iupaAopY

It may not be a 'bingo there is the answer' but it does give a different legal foothold.

[Mach9]

It’s certainly an interesting point. But I wonder if citizens of U. S. protectorates were ever free to migrate to any of the continental United States. They certainly weren’t permitted other citizenship privileges—like voting.

[faucetman]

“Rubio’s parents were born in 1927 and 1931 in Cuba”

*******************IRRELEVANT**************

Were they U.S. citizens when Marco was BORN? They were not, THAT is what is relevant.