Republican Sen. Marco Rubio—still pretending that he's not sure if he's running for president in 2016—had this to say during a recent interview: Rubio, who is 43, said his continuing career in public service is motivated by the nation being at a "generational, transformational crossroads." He dismissed Clinton as being on the wrong side of those particular tracks. "I just think she's a 20th century candidate," he said.