President Hugo Chávez has vowed to forge ahead with plans to transform Venezuela into a “socialist republic” along Cuban lines, despite suffering defeat at the polls.

The 53-year-old former paratroop commander conceded defeat in a referendum that would have rewritten the Constitution to give him virtually unchecked power, and theoretically allowed him to govern the world's fifth-largest oil exporter for life.

Mr Chávez said that he wanted to govern until 2050, when he would be 96 years old. Instead, after his first electoral defeat in eight years of power, the charismatic firebrand and close friend of Fidel Castro will have to step down when his current term ends in 2013.

Voters' rejection of his sweeping constitutional reform also enables an emboldened opposition to mount a referendum to “recall” Mr Chávez as early as 2010.

Mr Chávez said that his radical reform package had been defeated “for now”, but promised to find other ways to impose the measures. “I am not withdrawing a single comma from this proposal — it remains alive,” he told supporters. He promised to “continue in the battle to build socialism” in Venezuela, adding: “We are ready for a long battle.”

Repeating the phrase he used after his failed 1992 military coup, he said: “We couldn't do it — for now.”

The US Government cheered the poll defeat of its greatest Latin American antagonist. “It looks like the people spoke their minds, and they voted against the reforms that Hugo Chávez had recommended and I think that bodes well,” Dana Perino, a White House spokeswoman, said.

Tension reigned in Venezuela during a five-hour delay in announcing the result on Sunday night, in which the opposition believed the vote tallies were being altered.

In the end, the electoral authority announced that Mr Chávez had lost by the narrowest of margins — 49 per cent to 51 per cent. Mr Chávez admitted that he struggled for hours to decide whether to accept the result.

“I tell you from the heart,” he told supporters. “For a few hours I debated with myself, in a dilemma. I've left the dilemma behind and I'm calm.”

His conciliatory tone was in sharp contrast to his campaign rhetoric, in which he lambasted those planning to vote against his reforms as “traitors”, “fascists” and “mental retards”. He also cast the election as a straight contest with the US, saying a vote against him was a vote for George W. Bush.

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