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Hillary Clinton's campaign is calling Donald Trump "unfit and unprepared" in a mailer sent to some Utah voters, a rare dip of the toe into Utah's electoral waters by a Democratic presidential candidate.

The campaign wouldn't say how many mailers were sent out or what segment of voters they were targeting, but it is obviously not Democrats. The piece includes the image of a stern-looking woman above a paragraph that says: "You care about your community and the future of the country. That's why the thought of Donald Trump as president is so alarming."

Previously, Clinton penned an op-ed for the Deseret News and the campaign opened a state headquarters, but this is the first time the party spent money on an advertisement. And it is the first presidential attack ad during the general election in the state in decades. The mailer was funded by the Democratic National Committee and authorized by Hillary for America.

"Donald Trump's offensive rhetoric has made Utah more competitive than before, and given us an avenue to talk to new voters through many means," said Marlon Marshall, the director of state campaigns for Hillary for America. "We are happy to take advantage of that opportunity."

A Trump supporter in Utah said attacks are all that's left to the Democratic candidate.

"Secretary Clinton's actions in Benghazi are unforgivable. The Clinton Foundation is a total mess. The economy has slowed to 1 percent GDP. And amongst the host of other problems, her policies do not align at all with Utah people," said Don Peay, a prominent Trump for president backer. "So her only response is to make personal attacks against Donald Trump."

Trump is not popular in the state, even among Republicans, but he still holds a significant lead over Clinton. The latest poll, conducted by the Democratic firm Public Policy Polling, found Trump up 15 percentage points. He received the support of 39 percent, while Clinton got 24. Libertarian Gary Johnson got 12 percent, independent Evan McMullin, an anti-Trump conservative born in Utah, received 9 percent.

"There's not much of a chance that Utah's actually going to go Democratic this year," Dean Debnam, president of Public Policy Polling, said in a statement. "But with Gary Johnson in double digits and Evan McMullin almost there, there is a pretty decent chance that Donald Trump will end up winning the state with less than 50 percent of the vote."

Twitter: @mattcanham