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U.S. Sen. Marco Rubio (R-FL) waves to supporters after announcing his candidacy for the Republican presidential nomination during an event at the Freedom Tower on April 13, 2015 in Miami, Florida. Rubio is one of three Republican candidates to announce their plans on running against the Democratic challenger for the White House.
U.S. Sen. Marco Rubio (R-FL) waves to supporters after announcing his candidacy for the Republican presidential nomination during an event at the Freedom Tower on April 13, 2015 in Miami, Florida. Rubio is one of three Republican candidates to announce their plans on running against the Democratic challenger for the White House.

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Analyst: Marco Rubio poses biggest threat in 2016 race

CNN political commentator S.E. Cupp and Dan Pfeiffer discuss Jeb Bush jumping into the 2016 race, and presidential candidates to watch out for.

Analyst: Marco Rubio poses biggest threat in 2016 race

CNN political commentator S.E. Cupp and Dan Pfeiffer discuss Jeb Bush jumping into the 2016 race, and presidential candidates to watch out for.