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ST. LOUIS, MO - SEPTEMBER 7: Matt Cassel #16 of the Minnesota Vikings warms up prior to a game against the St. Louis Rams at the Edward Jones Dome on September 7, 2014 in St. Louis, Missouri. (Photo by Michael B. Thomas/Getty Images)

ST. LOUIS, MO - SEPTEMBER 7:  Matt Cassel #16 of the Minnesota Vikings warms up prior to a game against the St. Louis Rams at the Edward Jones Dome on September 7, 2014 in St. Louis, Missouri.  (Photo by Michael B. Thomas/Getty Images)