Analysis: 5 big storylines in the race for the Democratic presidential nomination right now

The 2020 field is -- almost -- set. With former Texas Rep. Beto O'Rourke getting into the contest last week, the only big shoe left to drop is that of former Vice President Joe Biden who -- if we're being honest -- is as close to running as you can be without saying the words "I am running for president." Or is there one MORE major candidate out there that we've been missing....??!?!?

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