Feldman: Chris Carpenter arguably the Cards biggest X-factor for 2013
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Credit: Getty Images
ST LOUIS, MO - OCTOBER 17: Matt Carpenter #13 of the St. Louis Cardinals is congratulated at the dugout by Mark McGwire and pitcher Chris Carpenter #29 after Matt Carpenter hits a two-run home run in the third inning against the San Francisco Giants in Game Three of the National League Championship Series at Busch Stadium on October 17, 2012 in St Louis, Missouri. (Photo by Dilip Vishwanat/Getty Images)
