The campaign finance fraud case for John Edwards ended in a mistrial Thursday when jurors acquitted him on one of six charges but were unable to decide whether he misused money from two wealthy donors to hide his pregnant mistress while he ran for president.

The trial exposed a sordid sex scandal that unfolded while the former U.S. senator's wife was dying of cancer, but prosecutors couldn't convince jurors the 2004 vice-presidential candidate masterminded a $1-million coverup of his affair.

John Edwards, centre, makes a statement with his daughter, Cate Edwards, father Wallace Edward, second from right,and mother Bobbie Edwards, right, as defence attorney Abbe Lowell, left, looks on after a mistrial was declared in Greensboro, N.C. John Adkisson/Reuters

"While I do not believe I did anything illegal, or ever thought I was doing anything illegal, I did an awful, awful lot that was wrong and there is no one else responsible for my sins," Edwards said on the courthouse steps in Greensboro, N.C.

He also said he had hope for his future.

"I don't think God's through with me," he told reporters. "I really believe he thinks there's still some good things I can do."

Edwards would have faced up to 30 years in prison and $1.5 million in fines if convicted of all charges. He did not testify, along with his mistress Rielle Hunter and the two donors whose money was at issue.

Jurors acquitted him on a charge of accepting illegal campaign contributions, involving $375,000 from elderly heiress Rachel (Bunny) Mellon in 2008. He had also been charged with illegally accepting $350,000 from Mellon in 2007, other donations from wealthy Texas attorney Fred Baron, filing a false campaign finance report and conspiracy.

The jurors, who deliberated nine days, did not talk to the media as they left the courthouse.

Federal prosecutors are unlikely to retry the case, a law enforcement official told The Associated Press on the condition of anonymity because the decision will undergo review in the coming days.

'I did an awful, awful lot that was wrong, and there is no one else responsible for my sin.'

— John Edwards

The case was thrown into confusion earlier Thursday after observers filled the courtroom expecting to hear a verdict on all six counts. Jurors had sent a note to U.S. District Court Judge Catherine Eagles, reading, "we have finished our deliberations and have arrived at our decision on counts one through six."

But when the jury came into court, the foreman said jurors only had a decision on one count. Eagles sent jurors back to deliberate. About an hour later, the jury sent another note saying it had exhausted its discussions.

The jury has made more news in recent days of the trial, as Eagles has closed the court to discuss unspecified issues with jurors. Four alternate jurors began wearing matching coloured shirts to court, and one of them was said to be exchanging smiles with Edwards. Eagles told the alternates on Wednesday that they no longer needed to come to court during deliberations.

When the not guilty verdict was read, Edwards choked up, put a single finger to his lip and took a moment to compose himself. He turned to his daughter, Cate, in the first row and smiled.

After Eagles declared a mistrial and discharged the jury, Edwards hugged his daughter, his parents and his attorneys. Later, he thanked the jury and his family, even choking up when talking about the daughter he had with his mistress Rielle Hunter.

He called Frances Quinn Hunter precious "whom I love, more than any of you can ever imagine and I am so close to and so, so grateful for. I am grateful for all of my children."

The trial recounted the most intimate details of Edwards's affair with Hunter, including reference to a sex tape of the two together that was later ordered destroyed and the drama of Edwards' wife, Elizabeth, tearing off her shirt in front of her husband in a rage about a tabloid report of the affair.

Political thriller

It also featured testimony that sometimes read like political thriller, as aide Andrew Young described meeting Edwards on a secluded road, and Edwards warning him, "you can't hurt me."

Prosecutors said Edwards knew of the roughly $1 million being funneled to Young and Hunter and was well aware of the $2,300 legal limit on campaign donations.

Defence attorneys said prosecutors didn't prove that Edwards knew that taking the money violated campaign finance law. They said he shouldn't be convicted for being a liar, and even if he did know about some of the money, it was a gift, not a campaign contribution.

"This is a case that should define the difference between a wrong and a crime … between a sin and a felony," attorney Abbe Lowell told the jury. "John Edwards has confessed his sins. He will serve a life sentence for those."

They also said the money was used to keep the affair hidden from his wife, not to influence his presidential bid.

Baron died in 2008 and Mellon, who is 101 years old, did not testify.

Edwards choked up when speaking of the daughter, now four, whom he conceived with his mistress while running for the U.S. presidency. He also thanked his parents for being in court with him every day of the trial, as well as his other children .