A movie made in Mexico – Colosio: El asesinato – is available on Netflix. Released in 2012, the film-based-on-fact examines a conspiracy behind the assassination in 1994 of Luis Donaldo Colosio Murrieta, a Mexican politician, economist, and PRI presidential candidate, who was assassinated at a campaign rally in Tijuana during the Mexican Presidential campaign of 1994. For those not familiar with the Spanish language, English subtitles are available.
“In 1994, Mexico’s ruling party’s presidential candidate is brutally murdered. Nobody knows who’s behind this event, it all points to a conspiracy. Andrés Vázquez, an intelligence expert, is commissioned to lead a secret investigation.” 
Not only is the Vázquez investigation secret, it is a parallel investigation, conducted in tandem with the official investigation, which has no knowledge of the Vázquez investigation .
In the “real” world, the case has been officially closed after many different prosecutors investigated it, but after the many mishandlings of the investigation and contradictory versions, controversy continues.  Officially a “lone nut” – Mario Aburto Martínez – committed the public murder. Mario confessed to the murder and was sentenced to 42 years in prison. However the New York Times reported that there was widespread belief within Mexico that the conviction involved a conspiracy and coverup mainly by Carlos Salinas de Gortari (the president at that time) and Manuel Camacho Solís.  Camacho, a Mexican politician who served in the cabinets of presidents Miguel de la Madrid and Carlos Salinas, now belongs to the Frente Amplio Progresista. However at the time of the 1994 assassination, Camacho belonged to the PRI (Institutional Revolutionary Party) along with Carlos Salinas.  Salinas is currently hiding out in Ireland, following the arrest of his older brother Raúl Salinas de Gortari. In 1999, Raúl Salinas de Gortari was convicted of ordering the murder of the PRI official (and Salinas brother-in-law) Jose Francisco Ruiz Massieu. On December 6, 2004, Salinas’s youngest brother, Enrique, was found dead in Huixquilucan, Estado de México, inside his car with a plastic bag strapped around his head. The case remains unsolved. In November 1995, Raúl Salinas’s wife, Paulina Castañón, and his brother-in-law, Antonio Castañón, were arrested in Geneva, Switzerland, after attempting to withdraw $84 million USD from an account owned by Raúl Salinas under an alias. Their capture led to the unveiling of a vast fortune spread around the world and amounting to hundreds of millions of dollars, even though Raúl Salinas had never officially received an annual income of more than $190,000. 
From the above brief synopsis, you can see that something fishy had been going on in Mexico around the time of the Colosio assassination. Part of that “something fishy” extended into the United States where the North American Free Trade Agreement (NAFTA) came into force on January 1, 1994.
Even if you are not especially interested about what goes on in Mexico, the movie Colosio: El asesinato will be nonetheless worthwhile to you for its exploration of the mechanics of political assassination. The movie is reminiscent of a film made in 1969, “Z”. “Z” presents a thinly fictionalized account of the events surrounding the assassination of democratic Greek politician Grigoris Lambrakis in 1963.  Colosio: El asesinato also calls to mind the 1968 assassination of Robert F. Kennedy since both victims – RFK and Colosio – seemed to be on the verge of success in their campaigns when they were suddenly exterminated.
——- Sources ——-
 “Colosio: El asesinato”, http://www.imdb.com/title/tt2398143/
 “Luis Donaldo Colosio”, Wikipedia, April 21, 2015.
 “Mario Aburto Martínez”, Wikipedia, April 21, 2015.
 “Manuel Camacho Solís”, Wikipedia, April 21, 2015.
 “Carlos Salinas de Gortari”, Wikipedia, April 21, 2015.
 “Z (1969 film)”, Wikipedia, April 21, 2015.