Here are five things to know about Mexico's midterm elections, seen as a referendum on President Enrique Pena Nieto's government halfway through his six-year term.

RULING PARTY TAKES CONGRESS

Pena Nieto's Institutional Revolutionary Party, or PRI, took the largest percentage of the vote. Together with two allied parties, the PRI coalition is expected to control as many as 263 seats for a majority in the 500-person Congress.

THE "BRONCO" TAKES NORTHERN STATE

Jaime Rodriguez, an independent candidate better known as the "El Bronco," is a tough-talking cowboy type who ousted the PRI to become governor of the key northern state of Nuevo Leon, which border Texas. His win is a first for Mexico, made possible by a reform last year people not affiliated with parties to run. Rodriguez's maverick persona resonated with voters fed up with the establishment parties, and he says his first priority will be fighting corruption.

LEFTIST OPPOSITION PARTY TAKES A BATH

The opposition Democratic Revolution Party won less than 11 percent of ballots and stands to lose up to a dozen seats, after two-time presidential candidate Andres Manuel Lopez Obrador split with the party and effectively divided the left-wing vote.

FROM THE SOCCER PITCH TO THE MAYOR'S OFFICE

Preliminary results have Cuauhtemoc Blanco, the recently retired national soccer hero, winning election as mayor of the city of Cuernavaca, outside the Mexican capital. It's the first foray into politics for Blanco, 42, and his lack of political experience has raised doubts among some. Known for his combative temperament on the field, Blanco didn't disappoint with a coarse dig at his rivals as he claimed victory: "Now I've screwed them," he said of his rivals.

NEW KID ON THE BLOCK

Just a year after being officially recognized, the Morena party founded by Lopez Obrador took about 8.5 percent of the vote and will have its first-ever representation in Congress.