The recently elected senator Marco Rubio (R-FL) has been talked up a lot as a VP nominee, because he's handsome (which appears to be GOP priority #1 these days), has a Spanish-surname, and got his start working for a Cuban-American Congresswoman who is half-Sephardic by ancestry so you know he's sound on the World's Most Important Issue: West Bank settlements. 

Putting a Cuban on the GOP ticket to win the growing Mexican vote makes about as much sense as when Newt Gingrich got the House to pass a statehood for Puerto Rico bill in 1998 to win the Mexican vote.