republican donald trump former reality tv star yet spend dime television advertise white house campaign democratic rival hillary clinton spend 52 million nbc news say tuesday add money lay outside group support candidates clinton camp spend 91 million ads versus million trump supporters nbc news say nearly 100 million spend general-election tv advertisements presidential race since primary season end donald trump campaign still spend single cent one say one group support trump rebuild america pac lead florida governor rick scott say roll anti-clinton ad cable local television station ohio florida north carolina week new york businessman buy ads abc cbs nbc air reality show apprentice successfully use social media reach mass frequently post facebook page twitter post turn like share countless time earn trump free form advertise study media analytics firm mediaquant place monetary value social media mention estimate trump benefit billion free media far figure expect rise billion nov. election clinton make gain social media 72 million mention july pull trump earn media trail last eight months mediaquant say former secretary state lead trump percentage point reuters/ipsos opinion poll release tuesday trump underspend clinton tv ads rely social media nbc