“This is the most complicated election we’ve worked on,” says the head of the major pollster, who discusses voter volatility ahead of the April 12 vote.

Apr 3–9: Also, Ecuador’s president opens door to U.S. troop presence and Mexico’s new foreign secretary builds on North American experience.

Mar 27–Apr 2: Plus, a year later, we look at the impact of Liberation Day tariffs on Latin American imports.