Sergio Massa, mayor of Buenos Aires, wins the midterm elections in Buenos Aires with a margin of over 12 points over a Peronist candidate supported by Christina Kirchner. Kirchner won election in 2011 with 54% of the vote. Since then her popularity has declined. Her faction of the Peronist party won about a third of the vote in the 2013 midterm elections but lost in Buenos Aires province which has about 40% of the national vote. Inflation estimated at 25% and slowing economic growth of about 3% are leading people to question the policies of president Christina Kirchner. Sergio Massa is a former chief of staff of Christina Kirchner who has formed his own party after differences with Kirchner on the need for a more business friendly policy to attract foreign investment.