Krista Henery, a spokeswoman for the Weld County District Attorney’s Office, confirmed the sentence to The Denver Post.
Curtis, 58, was after authorities said they found DNA evidence, and handwriting analysis linked him to the ballot of his ex-wife, Kelly Curtis.
Kelly Curtis moved to Charleston, S.C., in December 2015, according to what Weld County prosecutors say was introduced at trial, and when she called the county’s clerk and recorder to get her mail-in ballot, she was told she had already voted.
Prosecutors say they found that Curtis — who was the state’s GOP chairman in the late 1990s and also worked as a KLZ radio host — forged his ex-wife’s name on her ballot and mailed it in.
Prosecutors that Curtis claimed during the trial that he signed her ballot while he was suffering from a middle-of-the-night diabetic episode and then unknowingly mailed it in the next day.
He was convicted in the case in December.
Prosecutors initially said that Curtis faced up to three years in prison.