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Many people around Detroit love Philadelphia sports as well. Why? There are several reasons.
First of all, there wasn't really any bad blood after the 1997 Stanley Cup Final between the Red Wings and Flyers, and both teams grew to respect each other. The Red Wings-Flyers fan alliance has grown exponentially in recent years, as both teams share deep hatred for the Pittsburgh Penguins and Sidney Crosby, and many Detroit locals have also applauded the Flyers fans for their chants against the Penguins star.
Furthermore, many Detroit fans were rooting for Philadelphia in the 2010 Stanley Cup Final, because of a mutual dislike for the Chicago Blackhawks. This was flip-flopped the previous two years, as Flyers fans were pulling hard for the Wings to beat the Penguins.
Also, like the Rockies and Red Sox, the Detroit Tigers and Philadelphia Phillies have teamed up several times to try to get their players elected during the MLB All Star Game's Final Vote. It started in 2009 as the "Bran-Torino" campaign (Brandon Inge and Shane Victorino), and returned in 2011 as the "Victor-Victorino" campaign (Victor Martinez and Shane Victorino).
Finally, one last point about the hockey alliance, one based on my own experience: I spent a week in Philadelphia in April to watch the Flyers. I always hear about how harsh Flyer fans are towards fans of pretty much any other team, and I saw Buffalo Sabres fans getting heckled relentlessly. However, I proudly wore Detroit sports gear throughout the week, and got nothing but compliments from Philadelphians.