NEW ORLEANS (AP) _ Louisiana's insurance commissioner was sentenced Wednesday to 25 years in prison for using his position to help an ailing insurance company and taking bribes from a couple that bankrolled his campaign.

Doug Green, 41, was found guilty March 13 of 28 counts of mail fraud and conspiracy and two counts of laundering campaign loans. Under state law, he then was automatically suspended without pay, and Gov. Buddy Roemer has appointed an acting commissioner pending a November election.

U.S. District Judge George Arceneaux ordered Green to serve 28 concurrent five-year terms - the maximum allowed under federal sentencing guidelines - on the mail fraud and conspiracy counts. Then he must serve two concurrent 20- year terms for money laundering. He must report to federal prison Aug. 1. ''God knows how much anguish your acts have visited on the people of Louisiana,'' Arceneaux said.

''I'm not sure you understand, even now, the magnitude of your crimes. But our public officials must understand that such immoral conduct won't be tolerated,'' the judge said.

Green showed no reaction in court and refused to comment as he left the building.

A jury had found that Green conspired with Champion Insurance Co.'s owners, John and Naaman Eicher, to win the commissioner's office in 1987 and to use it to keep the failing company alive. Trial evidence showed he took $2.7 million in bribes.

Champion, then the state's third-largest auto insurer, failed in June 1989, leaving about $180 million in unpaid claims in Louisiana, $45 million in Alabama and an undetermined amount in Tennessee.

Green has pleaded guilty in Louisiana state court to public bribery and accepting a bribe as a candidate, and faces up to 10 years at sentencing set for June 20. Theft charges related to the Champion failure are pending in Alabama.

Arceneaux also sentenced Green to three years of probation and ordered him to pay $1,550 in a special assessment. But the judge said Green was broke, so a fine or restitution would be a hardship on his family.