Twitter: twitter.com Washington Redskins play the Arizona Cardinals in their fourth and final preseason game of 2010. Trent Williams and Rex Grossman may fair better this game with a weaker defensive unit in the Cardinals. Donovan McNabb of the Washington Redskins is out with a sprained ankle. I talk about the following: Rex Grossman, Dallas Cowboys, Tony Romo, and Matt Leinert of the Arizona Card…