It was a debate for the ages. Senator Elizabeth Warren led a relentless assault on Mike Bloomberg's record and character. The billionaire former mayor struggled to mount a defense. Senator Amy Klobuchar also came under attack. Her rivalry with former mayor Pete Buttigieg has reached a fever pitch. Meanwhile, former Vice President Joe Biden struggled to break through and frontrunner Senator Bernie Sanders largely avoided controversy. CNN political director David Chalian breaks down a historic night in Las Vegas with CNN senior political commentator Ryan Lizza.

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