MEXICO CITY (AP) — Mexico's four presidential candidates squared off in their third and final debate Tuesday night before the country's July 1 elections. The debate in the colonial city of Merida centered on economic growth, poverty, health, education and technology, based on questions culled from social media. Front-runner Andres Manuel Lopez Obrador holds a commanding lead of as much as 20 percent in some polls over his main rivals, Jose Antonio Meade of the ruling Institutional Revolutionary Party and Ricardo Anaya who represents a left-right coalition. Lopez Obrador and Meade sparred over the issue of economic policy, with Meade arguing that the policies of the leftist Lopez Obrador would lead to rising poverty and unemployment.Read more on NewsOK.com