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Thompson admitted setting up a $660,000 slush fund that aided Vincent Gray's election as District mayor in 2010.
The defense asked for probation and community service, citing his cooperation and noting his loss of businesses and status in the community.
The judge said Thompson's downfall was not enough of a deterrent to others.
A District of Columbia businessman who poured millions of illegal dollars into political campaigns, including Hillary Clinton's 2008 presidential bid and the Washington mayoral race, was sentenced to three months in prison followed by three months of home confinement.
Federal Judge Colleen Kollar-Kotelly also fined Jeffrey Thompson $10,000.
Thompson admitted setting up a $660,000 slush fund that aided Vincent Gray's election as District mayor in 2010. Several other people who worked on Gray's campaign pleaded guilty to felonies.
Gray denied wrongdoing and was not charged, but the scandal was a factor in his failure to win re-election.
Gray's case was dropped in December. He won the Democratic primary for the Ward 7 seat on the D.C. Council in June.
The defense asked for two years probation and 1,200 hours of community service, citing Thompson's cooperation with the investigation and noting how he has lost his businesses and his standing in the community, and the prosecution did not seek prison time, asking for six months home confinement and the fine.
But the judge said Thompson's downfall was not enough of a deterrent to others and called him the mastermind of the scheme who tried to obstruct the investigation once he was caught.