MEXICO CITY -(Dow Jones)- Mexico's leftist presidential candidate Andres Manuel Lopez Obrador holds a small lead in the final vote count being conducted by the Federal Electoral Institute, or IFE, based on results from 35.2% of polling stations, The Associated Press reported Wednesday afternoon. Lopez Obrador, of the Democratic Revolution Party, or PRD, is ahead with 37.1%, while conservative Felipe Calderon of the ruling National Action Party, or PAN, has 34.3% of the vote, according to IFE. A quick tally the night of Sunday's vote proved too close for IFE to call a winner, so election officials Wednesday started a...