TEGUCIGALPA—Leftist opposition candidate Xiomara Castro has claimed victory in Sunday’s Honduran presidential election, with only 40 percent of votes counted giving her a lead of 53.5 percent in the preliminary results. Castro, the wife of former President Manuel Zelaya, is rallying for president against Nasry Asfura, candidate of the ruling National Party, who stood at 34 percent in early counting, the national electoral council showed. Castro, 62, was competing in a field of more than a dozen candidates, and supporters hailed a triumph that would end a dozen years of conservative rule and return the left to power for the first time since Zelaya was deposed in a 2009 coup. In a brief address, Castro vowed to form a government of “reconciliation,” and to strengthen direct democracy with referendums—a tool that Mexico’s leftist President Andres Manuel Lopez Obrador has repeatedly employed. “There will be no more abuse of power in this country,” …