Quiz: How well do you know the Democratic presidential candidates?
Where the 2016 Democratic presidential candidates are concerned, you think you know - but you have no idea.
The three remaining Democrats in the race will square off Saturday night in the party's second primary debate of the 2016 campaign season, moderated by "Face the Nation" host John Dickerson.
Former Secretary of State Hillary Clinton enters the debate as the frontrunner, with Vermont Sen. Bernie Sanders in second. Former Maryland Gov. Martin O'Malley, a distant third in the polls, is hoping to gain traction.
All three candidates have been in public life for decades, serving at some of the highest levels of the government, and at least one - Clinton - is already a household name.
Still, even the most familiar public figures can pull off a surprise from time to time, revealing a little-known biographical fact or demonstrating an unlikely skill or habit.
With that in mind, here's a quiz to test your knowledge of the three Democrats running for president. Be sure to watch the Democratic debate on CBS, Saturday, November 14, at 9 p.m. EST, 6 p.m. PST.