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What you need to know ahead of MSNBC's Democratic forum

We put together this quick video ahead of tonight's event, where MSNBC's Rachel Maddow will interview the Democratic candidates.

The Democratic candidates for president will take questions from Rachel Maddow at 8 p.m. ET Friday in MSNBC's Democratic forum from Winthrop University in Rock Hill, South Carolina. Coverage begins at 6 p.m. ET.

Haven't been following every twist and turn of the campaign? Here's what you need to know.