https://sports.yahoo.com/sources-nfl-used-polling-firm-get-public-opinion-colin-kaepernick-050421636.html
According to sources, the NFL approved research that sought two pieces of information: Whether Americans believed Kaepernick should have been signed by an NFL team; and given that Kaepernick remained a free agent, whether fans believed that was because he refused to stand for the national anthem or due to his on-field performance or other reasons.
The sources said the poll also explored overall attitudes toward the potential disciplining of players who refused to stand for the anthem in protest over racial and social inequalities. That data was then divided into multiple demographics, sources said, including whites, African-Americans and Latinos, Democrats, Republicans and independents, and Baby Boomers, Generation Xers and Millennials.