Anti-establishment leftist Andres Manuel Lopez Obrador will be sworn in as Mexico’s next president yesterday—a dramatic change in direction for a country fed up with corruption, poverty and crime.

The man widely known as “AMLO” is promising a sweeping “transformation” after 89 years of government by the same two parties.

And he appears to have the mandate he needs to deliver it: he won a landslide victory in the July 1 elections, together with strong majorities in both houses of Congress for his coalition—led by the party he founded just four years ago, Morena.

It was the biggest win for any president, and the first for a leftist, since Mexico transitioned to a multi-party democracy in 2000. But the sharp-tongued, silver-haired leader inherits a sticky set of problems from his unpopular predecessor, Enrique Pena Nieto.

Lopez Obrador, a 65-year-old former protest leader and Mexico City mayor, has been short on specifics regarding his plans for all of the above.