MEXICO CITY (Reuters) - Mexican presidential front-runner Enrique Pena Nieto has widened his big lead over struggling ruling party candidate Josefina Vazquez Mota, with just 2 1/2 months to go until the July 1 election, an opinion poll showed on Sunday. The latest voter survey by polling firm BGC for Mexican newspaper Excelsior showed support for Pena Nieto, a member of the opposition Institutional Revolutionary Party (PRI), running at 50 percent, according to BGC's Website. That score was 3 percentage points higher than a previous BGC/Excelsior poll published on March 26. ...
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