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The prevailing narrative has been that data and analytics has powered a more effective ground game and digital strategy for recent candidates often giving them the edge (Obama).
It's safe to assume that Hillary Clinton's campaign has the most (winning) experience and resources in this respect as she inherited many of the operatives from the Obama camp.
For this reason, it would be really interesting if Hillary ended up losing the nomination. It would signal what we already know which is that there is some limit to marketing and advertising.
Voters/consumers often discern the difference between the candidate/product as it actually is and the perceptions of the candidate/product that the advertising campaign attempts to manufacture.
Especially for younger generations, people are increasingly immune not only to the content of advertisements but also to the tracking technologies utilized to effectively deliver those advertisements.
It will be interesting to see how these trends play out (increased reliance of campaigns on digital advertising and increased immunity to ads by younger generations).