Mexican candidate warns of election violence

MEXICO CITY (Reuters) - The presidential candidate for Mexico's main opposition party, Roberto Madrazo, warned on Wednesday that campaigning might turn violent if his opponents do not tone down their rhetoric.

Leftist candidate Andres Manuel Lopez Obrador is in an ugly war of words with President Vicente Fox, who he says is illegally using government resources to back conservative candidate Felipe Calderon.

Lopez Obrador said on Monday the president had "verbal incontinence" and accused Fox last week of being a plaything for the United States because he failed to resist U.S. plans to halt illegal immigration. Read on.