Declaring a race dead for the incumbent of an opposition party in a year likely to swing hard against the party in power is absolute bonkers. No amount of polling or ill-informed punditry will change that fact.
Your begging for the Missouri Democratic Party to be a thing is admirable, but pointless.
Rest assured that I do not care about the Missouri Democratic Party in this context absent the consequences the Senate seat has for the country at large. You do not know what is going to happen, and I do not know what is going to happen in this race, so you can drop that omniscient tone of yours.