If how Sen. Marco Rubio practiced for his response to President Obama's State of the Union is an example of his work ethic, then other potential 2016 GOP presidential candidates better step up their game.

The Florida son of Cubans and the Republican rising star prepared as if he was giving the president's speech, practicing for a week in a setting just like his actual response: at night and beside an American flag.

His office even tweeted a photo of one of the sessions, noting, "SNEAK PEEK: @MarcoRubio practicing for the #GOPResponse last week."