NEWYou can now listen to Fox News articles! A Mexican mayor who was outspoken in his opposition to drug cartels and pushed for hardline laws against trafficking was killed in a shooting at a Day of the Dead celebration this weekend.Before his death, Uruapan Mayor Carlos Manzo had been critical of Mexican President Claudia Sheinbaum for what he saw as a lack of effort in combating cartels. His city lies in Michoacán State, which suffers from particularly high levels of cartel violence."We need greater determination from the...