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You already know that America is getting more polarized by the day. Democrats and Republicans hardly live together, work together, or hang out together the way they used to.

But a new book called Fans Have More Friends argues that highly-engaged sports fans are less politically polarized, have greater trust in institutions, and generally live happier lives.

To learn more, GZERO's Alex Kliment met up with one of the book's authors, Dave Sikorjak, a marketing consultant who studies the motivations of sports fans. Where'd Alex and Dave link up? Where else -- at a tailgate in Philadelphia ahead of a game between the Giants and the Eagles. It all went great until Alex got taped to the front of a bus, but you'll get to that...