HARARE – Boxing legend Floyd Mayweather arrived in Harare on Thursday morning to take part in the political campaign of Zimbabwe’s autocratic leader Emmerson Mnangagwa. Since retiring in 2017, Mayweather has kept the money flowing by engaging in exhibition fights around the world for a minimum US$500,000, according to FightHype. The cost of his trip to Harare could top US$1 million after he flew…