Do they even want to? With the party lurching leftward and their candidates falling over each other and themselves to establish their socialist bone fides their election chances are slip sliding away. The battle line has been drawn as the 2 who had the temerity to say socialism is not the answer were booed by the faithful who want "free" stuff and want it NOW.
2020 may very well hinge on the economy, and 17 months is an eternity where the economy is concerned. There's just no way to know, although the general consensus is that a slowdown is definitely on the way...
The other side of that coin is the Dem's promise to undo all of our winning if we are dim enough to elect them. They have nothing to offer that will make most American's lives better.
Democrat Socialist Platform:
1) Hate Trump
2) Expensive gov't programs
3) Significantly higher taxes to pay for the new programs
4) Hate Trump
Seem like a winning strategy?