Argentina's Macri picks market-friendly senator as running mate

By Hugh Bronstein BUENOS AIRES (Reuters) - Argentina's presidential contender Mauricio Macri on Friday picked a business-friendly senator with middle class appeal as his running mate, reinforcing his center-right challenge to the ruling party's ticket. Senator Gabriela Michetti will join Macri in his campaign against front-runner Daniel Scioli, governor of Buenos Aires province. Scioli is allied with outgoing leader Cristina Fernandez, whose heavy-handed trade and currency controls hav