A prominent Democratic consultant offered this analysis of the current field: "I don't think there is a top tier. Replay More Videos ... MUST WATCH Who is the leader of the Democratic Party? 04:59The former vice president clearly regrets not running in 2016. But it's hard to see how a 2020 bid would be much different than his 2016 run. Mark ZuckerbergJUST WATCHED Mark Zuckerberg surprises family at dinner Replay More Videos ... MUST WATCH Mark Zuckerberg surprises family at dinner 01:01

Source: CNN May 02, 2017 17:15 UTC