* Ailing president due to be sworn in again Jan. 10
* Socialist leader recovering from cancer surgery in Cuba
* Cabello believes 'will of the people' matters most
By Daniel Wallis and Brian Ellsworth
CARACAS, Dec 19 (Reuters) - A government official in Venezuela for the first time has raised the possibility that Hugo Chavez's Jan. 10 inauguration could be delayed as the president struggles to recover from his latest cancer surgery.
Few details have been given about the 58-year-old leader's condition after his fourth operation in 18 months. Officials say he is lucid, but that doctors treated unexpected bleeding and then a respiratory infection after last week's procedure.
Comments by Congress leader Diosdado Cabello, a close ally of the president, suggest government officials may postpone the inauguration to accommodate Chavez's recovery.
Any delay would outrage the opposition, which has insisted for months that Chavez officially hand over power while he convalesces in Cuba. The constitution says he should be sworn-in again on Jan. 10, but there are conflicting interpretations over what would happen if he is not.
"You can't tie the will of the people to one date. If you didn't do it that day, if it isn't the tenth, doesn't the will of eight million people count?" Cabello was quoted as saying by local media on Wednesday.
Cabello spoke after a Socialist Party news conference, insisting he was offering his personal opinion and not the "official position" of his party or the national assembly.
He said the assembly could ask the Supreme Court, widely believed to be under the thumb of Chavez allies, for a ruling on any possible postponement. He said in one case a mayor was given a three-month extension to their inauguration date.
Cabello is the third most powerful figure in the government after Chavez's heir apparent, Vice President Nicolas Maduro.
One constitutional law professor said Chavez's inability to begin his third term on Jan. 10 would not automatically trigger new elections, as has been widely reported in media.
"The issue always ends up in a debate in parliament. It's the whole assembly that will decide" through a majority vote if the president is no longer fit for office, said Jose Vicente Haro of the Universidad Catolica Andres Bello in Caracas.
'RISK OF ANARCHY'
The confusion threatens to create an unruly transition to a post-Chavez government in the OPEC nation where the former soldier has vastly expanded presidential powers and built a near-cult following.
Opposition leaders decried Cabello's comments as a sign the Socialist Party could fiddle with succession rules to accommodate the president's recovery.
"They law guarantees order and peace. We must respect the constitution with no shortcuts because this could lead to anarchy, which nobody wants," said opposition legislator Hiram Gaviria. "There is no need for any interpretation by the Supreme Court."
The government said late on Tuesday that Chavez was "stable" again but needed complete rest after suffering a respiratory infection.
Chavez himself raised the possibility of his incapacitation before leaving for Cuba, naming Maduro as his preferred successor and urging Venezuelans to vote for the former bus driver if there were a new presidential election.
The consequences are huge, not just for a nation with the world's largest crude reserves, but also for an alliance of left-wing Latin American governments led by Chavez and dependent on his oil-fueled generosity to help support their economies.
One ally and fellow OPEC nation leader, Ecuadorean President Rafael Correa, said on Twitter late on Tuesday that Chavez was recovering satisfactorily, "and has even resumed work ... we have faith and hope that he will win this battle."
A new election would likely pit Maduro against opposition leader Henrique Capriles. In one sign of how the political forces are shaping up in Venezuela, Chavez allies won 20 out of 23 governorships in state elections on Sunday.
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