Sanders emerges unscathed, Bloomberg takes pummeling

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.To learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices