Mexicans will head to the polls July 1 to choose their next president, who will lead their country for a six-year term.

The stage appears set for a comeback of the nation’s once-dominant Institutional Revolutionary Party, the PRI. But with a month to go, there could be surprises.

In recent weeks, growing crowds of young Mexicans across the country have challenged pollsters’ figures that show the PRI candidate — Enrique Peña Nieto — some 20 points ahead of his two main opponents, Josefina Vázquez Mota and Andrés Manuel López Obrador. They also have accused Mexico’s two most powerful TV networks of being biased in Peña Nieto’s favor.

Analysts said whoever wins, the U.S.-Mexico relationship is not likely to change radically. Issues of security and trade have dominated the binational agenda — and likely will continue to do so, they added.

The candidates “have all said that they’re going to maintain economic stability, respect investment of foreign companies,” said Christopher Wilson at the Mexico Institute of the Woodrow Wilson Center International Center for Scholars in Washington, D.C.