In Mexico City, up to a million Mexicans marched Sunday in one of the country’s largest demonstrations ever to show support for the city’s mayor Andres Manuel Lopez Obrador. The protest came days after Mexican prosecutors filed charges against Lopez Obrador in a move that could bar the populist politician from running in next year’s presidential election. Two weeks ago the Mexican Congress–with backing from President Vicente Fox’s party — impeached Lopez Obrador as mayor and revoked his political immunity in an attempt to force him out of the race at a time that he is leading in all opinion polls. Lopez Obrador has vowed to fight the charges — and for the presidency — from behind bars if necessary.