There is a fascinating metric that indicates Democrats will win the 2020 Presidential election

Five; or one-third of the 15, potential Democratic presidential contenders; identified by the Predict It political odds-making forum on 20 January 2018, were female. That indicates Democrats have a strong chance of winning because women only tend to run for office when the odds are in their favor.

Fulton found that the tipping point for most women candidates to enter a race was 20% odds in their favor. She discovered that male politicians will enter a race if they have any chance of winning. Women only run when there is a real chance of victory.