Two of Mexico’s four presidential hopefuls began their campaigns on Friday, as the country looks set to reject the party that has governed for most of the past century over corruption scandals and favor a leftist dissenter.

Opinion polls ahead of the July 1 election show Andres Manuel Lopez Obrador with a large lead, with the mainstream opposition challenger second and the ruling party candidate far behind.

Second-place Ricardo Anaya, running for the right-left coalition “For Mexico in Front”, launched his campaign at just after midnight on Friday, holding a hackathon for 1,000 youths working on solutions to combat corruption and violence.

“Mexico is going to change,” Anaya told the crowd of cheering young people. “This corrupt government has its days numbered.”

Former first lady Margarita Zavala, who is in fourth place in the polls, also kicked off her campaign as an independent on Friday in Mexico City.