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Rippy previously entered a not guilty plea before Judge Algenon Marbley, who ordered him to remain in detention.
"Graphic threats of violence against anyone, but especially threats during high-profile events, are taken seriously and will be prosecuted," said David DeVillers, U.S. Attorney for the Southern District of Ohio.
Rippy faces five years in prison and a $250,000 fine at sentencing, which has not been scheduled.
He "understands and accepts" the terms of the plea agreement, his federal public defender, Soumyajit Dutta, said in a signed statement as part of Wednesday's plea agreement.
Rippy was arrested Dec. 28 in Livermore, California, and released on bond but then failed to report to the court's Pretrial Services division as required. Rippy also didn't report to a halfway house as required, court documents said.
He was rearrested in January and ordered sent to Ohio.
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