In 2013, at its peak, The NFL had a viewership of 4,333,000 White Male adults and only 896,000 Black Male Adults.
In 2016, a CNN exit polls shows that Donald Trump won 62% of White Male voters.
NFL viewership and Donald Trump’s supporters overlap substantially.
http://awfulannouncing.com/nfl/nfl-viewership-fell-in-nearly-all-demographics-and-all-regions-in-2016.html
http://www.cnn.com/election/results/exit-polls