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Academy Award-winning actor Richard Dreyfuss has been under fire from some on the left for attending a Ted Cruz campaign rally several weeks ago.

Dreyfuss' son, Harry, was so incensed that he wrote an article defending his father, which has quickly gone viral.

On "The Kelly File" tonight, the younger Dreyfuss explained that he was offended by the fact that his father was criticized for his curiosity.

He said that people on both sides of the aisle made the mistake of assuming that his father's presence at a Cruz rally meant that he supported Cruz and his views.

“I went to hear whether or not there’d be a difference between what I was hearing through the TV camera and live," Richard explained. "What was disappointing was that there was no difference. They sounded equally kind of silly.”

Although Cruz didn't win him over, he was happy to see the Texas senator live.

Harry said it's all too common that people, both on the left and the right, take pride in their certainty.

"When you're certain, that means that you can't learn anymore," Harry said, asserting that more people should be willing to listen like his father.

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