West Palm Beach, Florida (CNN)On the eve of the Florida primary, a reflective Marco Rubio looked out at a roaring crowd of diverse supporters and, once again, expressed regret. "The fact that I'm here now in front of those cameras comes with responsibility, and I'll confess, I've learned that myself," the Florida senator said. "A few weeks ago, in response to some attacks about the size of my ears and something else, I responded in kind with an attack about -- I'm not going to repeat it -- stuff." He ran through the list of people he embarrassed with his bawdy rumble with Donald Trump -- his children, his wife, his young supporters. READ: What's next if Marco Rubio loses Florida? "I felt...
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