He said the ruling party was playing with fire with its strong nationalistic rhetoric and the implication that a vote against Maduro was somehow subversive.
Capriles, too, has used emotionally charged language in his public comments. On Friday he denounced Maduro as a shameless liar who had not been elected by the people, and condescendingly referred to him as "boy."
Opposition figures have said they are concerned about the election's fairness, particularly given the public vows of allegiance to Chavez from senior military officials. Capriles lost to Chavez in Oct. 7 elections, but he garnered 45 percent of the vote, which was the most anyone had ever won against the late president.
A boycott of 2005 legislative elections was widely seen as disastrous for the opposition, letting Chavez's supporters win all 167 seats and allowing him to govern unimpeded by any legislative rivals.
Associated Press writers Frank Bajak, Jorge Rueda and Vivian Sequera contributed to this report.
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