I actually think this is a pretty fair and accurate observation.
What I think is the fuel that allows the above process engine to continue to burn, however, is mostly something the Dems are responsible for and is in their control. Namely, that of not having a provocative point of view and being willing to be better politicians (e.g. fight, go low, fire up their base, etc.) and instead whine and moan and always be in react mode (e.g. But Trump! and What-about-when-an R did it? and R's are being hypocritical, etc.) So the sore loser moniker and victomhood persona becomes a prophecy fulfilled.
It's like my boy Napoleon said, somebody gotta explain why I ain't got nothing
It's like my boy @bad_teammate said, Dems need to grow a spine and stand and deliver otherwise you are the political Dallas Cowboys led by Mike McCarthy. You aren't managing the clock well despite having the better players and odds on paper and always blame the refs when you lose.