Imperial Japan's strategy for war with the US was the Big Battle, which they never got.
The Dems' strategy of the past ~3 1/2 years has been the Big Gotcha-Trump, and their gotchas keep blowing up in their face. So the Dems' nightmare, I think, is that come September/October:
* The economy is recovering strongly;
* One or more Covid-19 treatments and vaccines are approved/approvable;
* The Trump-Russia-Collusion-Delusion and Flynn shamvestigations have gone nuclear in the Dems' face.