Salvador Sanchez Ceren, presidential candidate for the Farabundo Marti Front for National Liberation (FMLN), speaks to his supporters after the official results in San SalvadorBy Nelson Renteria SAN SALVADOR (Reuters) – A former Marxist guerrilla leader looks poised to win El Salvador’s presidential election runoff on Sunday as voters embrace his ruling party’s social programs despite opposition allegations that he plans to veer the country to the radical left. Polls show Salvador Sanchez Ceren, a top leader of the Farabundo Marti National Liberation Front (FMLN) rebel army during the country’s 1980-92 civil war, with about 55 percent support ahead of the runoff vote, enough to secure his party a second consecutive term. His opponent Norman Quijano, the conservative former mayor of the capital, San Salvador, trails with about 45 percent amid waning support for his right-wing Arena party. Quijano has warned the ex-rebel will move El Salvador to the radical left and bow to the influence of Latin America’s leading U.S. antagonist, socialist-led Venezuela.