Mexico leftist holds 6-point presidential poll lead Thu Jan 26, 2006 11:01 AM ET (Recasts; adds details, background) By Greg Brosnan MEXICO CITY, Jan 26 (Reuters) - Mexican leftist presidential candidate Andres Manuel Lopez Obrador's lead over his nearest rival has been halved to six points since November, according to poll results released on Thursday. The survey by daily newspaper El Universal gave Lopez Obrador, the former mayor of Mexico City, 33 percent support, with Felipe Calderon of the ruling National Action Party in second place with 27 percent. In its last poll in November, El Universal had Lopez Obrador...