Ricardo Monreal (R), lawmaker of the Citizen Movement party and ex campaign manager for Mexican leftist leader Andres Manuel Lopez Obrador, walks along a corridor at Medica Sur hospital in Mexico City... more 
Ricardo Monreal (R), lawmaker of the Citizen Movement party and ex campaign manager for Mexican leftist leader Andres Manuel Lopez Obrador, walks along a corridor at Medica Sur hospital in Mexico City December 3, 2013. Lopez Obrador, runner-up to President Enrique Pena Nieto in last year's election, suffered a heart attack early on Tuesday and was admitted to hospital, but is improving, doctors said. REUTERS/Tomas Bravo (MEXICO - Tags: POLITICS HEALTH) less 
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Reuters | Photo By TOMAS BRAVO / REUTERS
Tue, Dec 3, 2013 5:07 PM EST