Most ordinary people don't engage in this type of behavior, whether it's undertaken on behalf of the political right or the left.
"The population as a whole is just going about their business and raising their kids. They only get into politics when they have to," he said.
But those who exhibit these extreme behaviors have let "partisanship become a political identity," he said.
To them, politics is no longer just about different points of view on policy. Opposing views become a personal threat and insult, he said.
"It's extremely abnormal," he said. "It's so counterproductive. It just alienates the kind of people you want to persuade."
The misconception that these extreme behaviors are widespread has been fanned by social media and television, and that's unfortunate, he said.
Fiorina added that a percentage of the population won't even disclose their political affiliation because of the current charged environment.
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