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Among the recent cases that resulted in probation, Snapper faced up to 16 months in prison under federal sentencing guidelines. But he was given three years of probation after his defense attorney noted that he cooperated with the government.

He pleaded guilty to covering up contributions from funds that belonged to novelist Patricia Cornwell, whose finances he managed. She’s now suing him and the firm he worked for, accusing him of mishandling her money.

While Snapper said he made the contributions as a favor to Ms. Cornwell, her attorneys said in recent civil court filings that she did nothing wrong and that Snapper was the sole target in the federal campaign finance investigation.

Perhaps the biggest campaign finance case filed in recent memory has yet to be resolved, with former Sen. John Edwards, North Carolina Democrat, facing felony charges that he accepted illegal campaign contributions to hide his affair and out-of-wedlock child. If convicted, he faces up to 30 years in prison and a $1.5 million fine. Mr. Edwards has pleaded not guilty.