Webb Ross, 81, interrupted Lincoln during a question-and-answer session with reporters outside the Little Rock church where she voted with her family.
As Lincoln described herself as a centrist – “right there in the middle, a moderate, in the United States Senate” – Ross interjected: “That’s just not true.”
“You have not been in the middle,” he said. “You have voted left with your party all of the time. I’m sorry, but that is not a true statement."