Stocks edged lower Tuesday as investors may have been discouraged by dragged out debt ceiling talks and news that Germany's economy expanded only 0.7% in 2012. In US economic news however December retail sales were better than expected at 0.05% indicating that consumer spending is up.   The Dow (INDEXDJX:.DJI) opened at 13476 down 0.26% and gained a few points to 13487.07. The Nasdaq (INDEXNASDAQ:.IXIC) opened at 3095.12 down 0.69% and moved up to 3100 (-0.53). The S&P 500 (INDEXSP:.INX) began at 1464 -0.39% and inched up to 1469.06 (-0.18%).   Dell (NASDAQ:DELL) shares rose 1.58% to $12.48 after ...