A party of former leftist guerrillas gained ground in this week's elections but failed to wrest control of congress from conservatives, official results released Monday show. The Farabundo Marti National Liberation Front, or FMLN, won 31 congressional seats — four more than the ruling Nationalist Republican Alliance, or ARENA. However, ARENA was counting on the 16 seats of its traditional conservative ally the National Conciliation Party, or PCN, for a slim majority in the 84-seat congress. "We needed to get that legislative majority," lamented Carlos Rivas Zamora who led the FMLN in an overwhelming victory Sunday for the mayorship of...