Who Are the "Other 3 Dudes" Running For the Democratic Nomination?

Age: 69
Credentials: Former senator from Virginia, Secretary of the Navy under Reagan, and Vietnam vet. Most of what we know about his politics stems from his Democratic response to the 2007 State of the Union, where he was pretty hard on President Bush. So far, most of his opinions and campaigning have happened on his Twitter feed.
Fun fact: Webb has written 10 books and won an Emmy. Remember that intense Samuel L. Jackson and Tommy Lee Jones war movie Rules of Engagement? That was this guy.
How he fared in debate no. 1: In his debate intro, Webb came out swinging against money in politics and also highlighted his work outside politics. And how can we forget the shout out to his five daughters?