Lpez Obradors appearances at press conferences and on television this week indicated that he was prepared for a long fight. That became clear in a heated exchange between Mr. Lpez Obrador, the populist former Mexico City mayor, and Mexicos leading news anchor, Joaqun Lpez-Driga, Tuesday night: Mr. Lpez-Driga: Where is this going to end, Andrs Manuel? How far are you going to take it? Mr. Lpez Obrador: To the people. Mr. Lpez-Driga: How far is that?