In a congressional race in the northern suburbs of Atlanta, Democrats have been spending the precious final days of the campaign making an urgent appeal: Do not vote for the “Democrat.”

After a dizzying sequence of events, the party has disavowed the candidate listed as its nominee for Georgia’s 11th House District: Katy L. Stamper, a lawyer who argues that the Republican incumbent is not conservative enough and has offered herself as a choice who would be.

The platform presented by Ms. Stamper, who refers to herself as an “independent candidate running on the Democratic ticket,” includes a call for the mass deportation of undocumented immigrants, whom she has described as “invading ungrateful hordes.” She wants to repeal the right to gay marriage. She supports free therapy for transgender people, but only because, as she says on her campaign website, “We should help them deal with their mental injuries without pretending reality is other than it is.”

As a result, Democrats have been scrambling to mobilize a write-in campaign, trying to direct support to another candidate — one with views that are not diametrically opposed to the party’s position on just about every issue.

Tracey Verhoeven, a relative newcomer to Georgia politics, has emerged as that candidate.

Her campaign, which began in August, has claimed TheRealDemocrat.com as the domain for its website. Yard signs — including one warning of a “Fake Democrat” — were printed in just the past few weeks. And volunteers have been handing out cards that voters can take with them to the polls explaining how to write in a candidate.

“What she did was not right,” Ms. Verhoeven said of Ms. Stamper, sitting at a brewery and barbecue spot in Woodstock, Ga., that has served as her de facto campaign headquarters, “and I want to rectify it.”

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