This means he can be replaced with another Democrat
Graham Platner can be replaced as the Democratic nominee for Senate in Maine if he withdraws from the race by next Monday, and state law would then give the state Democratic Party until July 27 to name a replacement.
It wasn’t his to make because they had a primary, but if we’ve learned anything over the last decade, if the DNC can avoid an election from the plebeians, they will, and they’ll just shove what they want down our throats and say, "its this or trump, take it or leave it "
I should note, schumer is just the stand in name I’m using here, I’m really referring to the DNC itself.
The DNC has no real power to tell state parties what to do in a situation like this. In point of fact, their members are largely chosen by the state parties.
I hope you’re right, but forgive me if I don’t hold my breath.