Mr. Anuzis noted that the Fox News commentator Glenn Beck had picked up the theme, as did some participants at the antitax “tea party” rallies last week. Mr. Anuzis spreads the word on Facebook and Twitter.

But that discomfits other conservatives who question its accuracy and political wisdom.

“I don’t think the word ‘fascism’ applies at all,” said the CNBC commentator Larry Kudlow, a sharp critic of Mr. Obama’s tax and spending policies. “Barack Obama is not a dictator. He’s a liberal.”

Tony Fabrizio, a Republican pollster, said: “If what you’re trying to do is reach out to the middle, the more extreme the language, the less likely they are to pay attention. We sound like white noise in the background. It’s like a yipping Chihuahua.”