he says mexico will not pay for trump's border wall. dozens of politicians have been killed across mexico and the key to the future of mexico with more than 600 positions up for grabs here. the country's relationship with the u.s., of course, is at a crossroads. here is lein santiago. >> reporter: in mexico's largest stadium he fills almost every seat. ♪ >> reporter: andres manuel lopez obrador is on his third attempt to become mexican's president. the leftist candidate is promising to crack down on the crime. the populist candidate's message for change is resonating with voters. [ speaking in foreign language ] >> reporter: he has vowed to put