The Hill 
July 31, 2013
Sen. John McCain (R-Ariz.) joked that it would be a tough decision to vote for Sen. Rand Paul (R-Ky.) over Democrat Hillary Clinton if both won their party’s presidential nomination in 2016.
“It’s gonna be a tough choice,” McCain said with a laugh when asked about it in an interview with the New Republic  published Tuesday.
McCain clarified that he believes Paul is trying to expand the GOP brand, and that he represents the same libertarian-leaning part of the party once represented by his father, former Rep. Ron Paul (R-Texas).
However, McCain heaped praise on another prospective Republican presidential candidate in 2016, Sen. Marco Rubio (Fla.). He called Rubio a “valuable candidate for president” and said his push for immigration reform will not impede his presidential prospects, harkening back to his own failed bid in 2008.