1. O'Malley tries his hand at name-calling. When addressing the topic of compromising with Republicans on immigration, O'Malley didn't hold back, bashing Republican rival Donald Trump.
>> Click here to watch the clip
2. Sanders slams chatter about Clinton's emails ... again. At last month's first Democratic debate, Sanders made headlines and thrilled social-media users by saying of the Clinton email scandal, "The American people are sick and tired of hearing about your damn emails."
>> Watch the video here (start at 2:34 timestamp)
3. Sanders ties terrorism to climate change. The senator doubled down on earlier statements that climate change is the greatest threat to national security – and went even further by saying the two threats are connected.
4. Clinton: Sanders is trying to "impugn my integrity." The debate heated up when Sanders slammed Clinton for accepting donations from Wall Street.
5. Sanders gets feisty about gun control. O'Malley touted Maryland's gun-control measures, to the chagrin of the Vermont senator.
>> Click here to see the exchange (start at the 11:51 timestamp)
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