By MarketsFarm WINNIPEG, Dec. 24 (MarketsFarm) The Canadian dollar was slightly weaker Tuesday morning in thin pre-Christmas trading. At 9:48 CST Tuesday morning the Canadian dollar was at US$0.7602 or C$1.3154 which compares with Monday’s North American close of US$0.7599 or C$1.3160. Crude oil was softer in early activity. The TSX was up by 5.65