Colombia resumed its peace efforts with leftist rebels Monday, supported by President Juan Manuel Santos' victory in weekend elections seen as a referendum on his attempt to end the 50-year-old conflict. Santos won 50.95 percent in Sunday's runoff vote against the more conservative Oscar Ivan Zuluaga, validating his insistence on continued negotiations with the Revolutionary Armed Forces of Colombia (FARC) and the smaller National Liberation Army (ELN). In his victory speech late Sunday, Santos promised a "fair peace" without "impunity," but he acknowledged that "we will have difficult moments to guarantee that it is not only fair but lasting."