TSX nears three-week low as oil sells off

By John Tilak TORONTO (Reuters) - Canada's main stock index dropped to its lowest in nearly 3 weeks on Tuesday as oil prices plunged on renewed concerns about a global supply glut, helping push down shares of energy producers. The release of sluggish U.S. economic data, with new orders for factory goods dropping for a fourth straight month in November, contributed further to the bearish mood. Oil prices touched a 5-1/2-year low and have slid almost 10 percent in the last two sessions. They