Samper was elected president in the second-round voting, once again by a narrow margin, 50.37% to 48.64%, over Pastrana. Campaign scandal Shortly after his presidential victory, Samper was accused by Pastrana of having received campaign donations from the Cali Cartel of $3.75 million US dollars, with journalist Alberto Giraldo Lopez as the intermediary. Samper initially denied the allegations. Soon afterwards, a series of damaging tape recordings were released to the public. Years later, the DEA's Joe Toft would claim ownership of the recordings. Gustavo de Greiff, Colombia's outgoing Chief Prosecutor cleared Samper of wrongdoing, after what critics termed a "less-than-exhaustive" investigation. His successor, Alfonso Valdivieso Sarmiento, personally led a new investigation. Valdivieso was a cousin of the late Luis Carlos Galán, a charismatic Liberal party presidential candidate assassinated in 1989 by the Medellín Cartel for his political views, particularly for favoring the extradition of drug lords to the United States. Valdivieso discovered connections between the Cali drug cartel and top figures of Colombia's society, including the Colombian comptroller general, the president of the lower house of the Colombian congress, and nine congressman, as well as journalist Alberto Giraldo, who openly admitted to having ties to the Cali cartel. Although Samper's campaign treasurer, Santiago Medina, came under investigation, Valdivieso refused to re-open the "narco-cassette case" that had been closed by de Greiff. As a result of the investigation, Santiago Medina, the campaign's treasurer, was arrested for accepting $50,000 from a company known to be a front for the Cali cartel. Just after Medina's arrest, Samper gave a unscheduled, nationally televised address where he admitted the possibility that drug money had gone to his campaign. On 31 July 1995, days after Medina's arrest, Fernando Botero, who had been Samper's campaign manager, and Horacio Serpa, another political ally, held a press conference to deny Medina's allegations, armed with copies of Medina's testimony to the chief prosecutor. Serpa said the testimony had come from "anonymous sources", but they were allegedly stolen from the prosecutor's office. Valdivieso appeared on national television to angrily denounce Botero and Serpa for divulging such testimony. Medina was later convicted, and sentenced to prison. On 2 August 1995, Botero resigned as defense minister, soon after Valdivieso asked the Colombian supreme court to investigate his role, and that of communications minister Armando Benedetti, in Samper's campaign financing. On 15 August, Botero was arrested in connection with the investigation. Other political figures,