I have no idea why Atlas overhypes Hispanics so much. Trump won in FL despite doing completely garbage with hispanics. White voters are 60% of the electorate, so it makes more sense for Nelson to campaign to old white voters rather than Latino voters. I actually think Nelson should be primarily focusing on old white voters who care about health care.
The obsession comes from when people were going on about how Obama won the 2012 election thanks to Hispanics based on exit polling data.
The problem is that exit polls dramatically overestimate non-white turnout. Obama would have won in 2012 if Latinos voted like they did in 2004 and nothing else changed.
The Upshot did a great article on this in June 2016:
https://www.nytimes.com/2016/06/10/upshot/there-are-more-white-voters-than-people-think-thats-good-news-for-trump.html 
