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what does that mean to you? >> he might think like i do. and have same views as i do. >> reporter: like the extra sugar heaped in cuban coffee, here rubio's heritage sweetens his appeal. what do you think rubio's biggest strength is? >> his background. his double culture. the united states is changing. >> reporter: rubio's quick political rise does include some awkward moments. pressure appeared to get the better of him with that water break delivering the gop state of the union response in 2013. and now more personally. rubio is challenging his own mentor, fellow floridian jeb bush, who is also expected to run for president. and rubio is the third first-term senator to get into the race, but unlike ted cruz and rand paul, he's more establishment than tea party. and unlike, rand paul, his aides tell me that rubio will not seek re-election to the senate while he's running for president. lester? >> kelly, thanks. i'm joined by chuck todd, our political director