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