http://www.dailymail.co.uk/news/article-2397661/Study-ranking-NFLs-loyal-fans-finds-Dallas-Cowboys-really-ARE-Americas-Team--Oakland-Raiders-come-last.html


The Dallas Cowboys have worn the nickname 'America's Team' as a badge of honor
for 35 years, and now two university professors have given some academic weight
to that title.
A study from Emory University in Atlanta found that the
Cowboys, long a fixture on America's TV sets, have the most loyal fan base in
the NFL.
The study measured fan attendance on game day and controlled for
factors like the size and wealth of the market and whether fans still turn up
when the team isn't performing so well on the field.
Take it how you want (Size and Wealth shouldn't matter, i would however like to see this ranking with just fans turning up when the team is down)