Mr. Rubio's tendency to memorize-repeat-rinse-repeat-rinse-repeat is not a phenomenon born from the pressure of his presidential campaign. Neither is it new.
"Do you get the feeling that 'Marco Rubio' is not an actual human being at all but some kind of computer program designed by the Republican Party? Imagine they had the technical know-how to create a candidate like this. What would they come up with? They'd come up with Marco Rubio, a cinematically handsome Latino from Florida who hews to the Tea Party line while spitting out patriotic cliches that sound as if they were programmed by a computer... I'm not saying I'm sure Rubio is a robot. I'm just saying that I want to watch him walk through a metal detector."
(Jonathan Chait, commentator and writer for New York magazine, from an article he wrote in 2011)