- Unlike the Republican debates, there will only be one Democratic presidential candidates debate.
- The main debate featured all three candidates: Hillary Clinton, Bernie Sanders and Martin O'Malley.
- To qualify for the debate, candidates needed to earn 5% in recent national polls or surveys in Iowa, New Hampshire or South Carolina.
- Despite some initial concern that O'Malley would not qualify for the debate, NBC News announced on 14 January that he was eligible.
- The debate, hosted by NBC News and also broadcast on YouTube, was aired live from the Gaillard Center in Charleston, South Carolina.
And that's a wrap for the last Democratic debate before primary voting begins in February. Republicans will squeeze one last debate before the Iowa caucus on 1 February.
Sanders returns to one of his most popular topics: campaign finance reform. Calls for an end to super PACs.
Clinton, meanwhile, focuses on the Flint water crisis. She says the governor of Michigan failed the people of Flint, adding, "I want to be a president that takes care of the big problems."
O'Malley is asked if there is anything he wants to say that he didn't get to say. The question receives laughs from the crowd, particularly since O'Malley has barely been given time to speak. O'Malley mentions immigration, Puerto Rico and conflict in Central America.
Clinton is asked about her husband, former President Bill Clinton: "I am going to ask for his ideas. I'm going to ask for his advice."
Can I get 30 seconds, too?
- Martin O'Malley after Clinton is given extra 30 seconds after she's cut off by a commercial break
Next YouTube question comes from Marques Brownlee for O'Malley on privacy, technology and encryption. O'Malley responds: "The government should get a warrant, whether they want to come in via your back door or front door."
- Sanders: 1st priority should be getting rid of Islamic State (Isis/Daesh) and 2nd priority should be to depose of Syrian President Bashar al-Assad
- O'Malley: We need more human intelligence on the situation in Syria and what would happen if Assad is deposed.
The debate quickly turns to Syria and whether the candidates would put "boots on the ground". Sanders points to the war in Iraq, while O'Malley thanks his fellow candidates for not referring to US servicemen and women as "boots on the ground".
The issue many were expecting: the Iran deal.
Sanders says that relations between the US and Iran should be normalised. The senator adds that the Iran deal is a positive step, but that he does not think the US should open an embassy in Tehran.
Clinton talks about her role in the sanctions initially placed on Iran and says she supports the Iran deal. However, she says that the US should continue watching Iran.
Candidates are asked moving away from fossil fuels and climate change. Sanders calls out Republicans for not believing in climate change, while O'Malley asks his fellow Democratic candidates to join him in pushing for 100% clean energy by 2050.
While Sanders wants to raise taxes to pay for free college and other entitlements, Clinton says she does not want to raise the taxes of the middle class.
Learn exactly where each candidate stands on regulating Wall Street (based on their campaign websites):
Clinton takes on Sanders and his alleged criticisms of President Obama. She says she agrees with Sanders on a number of issues, but says she will continue to support Dodd-Frank.
The debate now takes on the economy. Sanders is asked about his campaign video on Wall Street posted last week.
Second YouTube question comes from Connor Frente and it's for all the candidates. How will they get more young people to vote for them.
Clinton focuses on rising student debt, more jobs and moving forward on women's rights and gay rights.
Another question for Sanders. This time he's asked about labeling himself a Democratic Socialist. He says that the Democratic Party needs to be changed.
The debate, nearly an hour in, has been focused on frontrunner Clinton and Sanders. Viewers have noticed that O'Malley has been left largely out of the conversation—including Republican presidential candidate Rand Paul, who's Tweeting the #DemDebate.
Clinton and Sanders spar over Sanders's healthcare propositions. Clinton claims his new plan will destroy Obamacare, adding, "I don't want to see us start over again. I want us to defend and build on the Affordable Care Act and improve it."
We have to move away from treating the use of drugs as a crime and instead, move it to where it belongs, as a health issue. We need to divert more people from the criminal justice system into drug court, into treatment and recovery.
- Hillary Clinton
When asked how authorities should deal with the rise of heroin addiction in the US, Clinton calls for all officers to be properly trained and equipped with Narcan to deal with overdoses.