Positive views of NFL down 18 points since 2013: Fox News poll
Chart: How The Public Feels About The NFL Kneeling Protests
The NFL is being squeezed by boycotts from both sides over anthem protests
NFL boycotting driven by both Trump and Kaepernick
Study Looks at Who Supports NFL Players' Anthem Protests - UT Dallas Magazine
Donald Trump, not Colin Kaepernick's anthem protest, cut into NFL ratings last season – New York Daily News
The NFL and the Super Bowl are TV's last weapon against streaming
The NFL's ratings are down. But national anthem protests aren't the whole story. - Vox