The man who could be Argentina's next president wants to put an end to tight government currency controls, make peace with the nation's creditors and improve severely frayed ties to the United States.

In other words, Mauricio Macri is promising to undo much of what President Cristina Fernandez and her late husband Nestor Kirchner created over the past 13 years.

It's a platform that appears to be gaining traction.

The right-leaning Buenos Aires mayor leads many polls ahead of the October elections. His popularity is buoyed by economic frustration and widespread anger over the mysterious death of federal prosecutor Alberto Nisman, who accused Fernandez of protecting those responsible for Argentina's most serious terror attack.