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Mexico’s mid-term elections on Sunday have been marred by one of its bloodiest campaigns, even in a country known for its drug cartel wars and soaring homicides.

Left-wing President Andres Manuel López Obrador’s ruling National Regeneration Movement (Morena) party and its allies are hoping to head-off an opposition challenge and keep their majority in the lower House of Congress.

But in recent weeks, Mexican media have been running daily stories of threats, kidnappings, attacks and murders committed against