A special prosecutor said Tim Nolan, 71, targeted young women and gave them opioids and threatened to withhold the drugs or call law enforcement if they didn't perform sex acts.
Nolan maintained his innocence on all charges and tried to delay his sentencing multiple ways, including firing his attorney in March and trying to withdraw his guilty plea.
On Friday, he apologized in court and promised to seek treatment.
Nolan received the maximum sentence for his crimes.
The Daily Beast reported earlier this year that Nolan was the “self-proclaimed” chairman of the 2016 Trump campaign in Campbell County, Kentucky – a fact that no one questioned until charges were filed against him.
Following Nolan’s arrest, campaign officials denied he had ever held the position.