She expressed concern about the impact on accountability.
"I worry now that we've been terminated from the board what comes of this is that people are less likely to speak out … that politicians will go unchecked on these sort of decisions," Proff said.
Polis previously defended the commutation by pointing to a judicial review.
"It was a straightforward decision because, after reviewing the facts, and reading the Appeals Court decision, I concluded that her sentence was simply too long," he wrote.
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In a joint op-ed in The Denver Post, the board members argued that the problem extended beyond Peters' case.
"It is what his decision reveals. That the system bends for some and holds firm against everyone else," they wrote.
Spokesperson Eric Maruyama said the administration maintains strict operational protocols.
"Publicly disclosing board recommendations and how members vote on any case threatens the credibility of the board, colors future deliberations by the board and breaks clearly stated confidentiality policy," he said.
Maruyama added that future applicants can expect full confidentiality. When asked about Peters' recent meeting at the Oval Office, he redirected focus to state fires.
Political commentator John Jackson criticized Polis on social media.
"Hey @GovofCO a real garbage move on your part, punishing the clemency board and freeing the unrepentant criminal Trump is using to try and steal the midterm elections," he wrote.
Academic Karen Piper questioned hidden motives. "Does Trump have dirt on him or what?"
she wrote.
Radio host Mat Smith called Polis "an absolute lowlife" and said he "lit himself on fire on the way out the door."
Peters, the former Mesa County clerk sentenced to nine years in prison for voting system tampering, was released on June 1.
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The governor's office has quietly appointed two new members to fill the vacant seats.