Considering he was limping before the game started and Cousins is a pretty decent backup, yea there's no excuse. That decision pretty much erased everything RG3 and the Redskins achieved this year. It seems Shanahan is in some kind of denial.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma