Lets play a little devils advocate.
1. Media coverage was overwhealmingly _off_ when extrapolating the trends from earlier in the election night, to when mostly mail in ballots were left to count. They enforced the narrative that 'something might be wrong here' simply by reporting without any knowledge about statistical trends being able to reverse in the counting of the vote, or knowledge about a potential 'blue wave' in mail in ballots.
2. When researching on the possibility of a blue wave in mail in ballots, most of the articles at that point (one or two days before the election, when I posted the California institute of tech paper on it) out there where completely certain, that there would be no inherent bias for one party or the other in mail in votes. (Partly because no one expected, that the Trump campaign could mobilize that much latino and black votes as in person votes at that point?). This included many major news sources.
3. Polling was off as hell.
4. Trump is loosing by a far smaller margin than anyone expected beforehand.
5. If democrats mess up the senate race this time around, we really have to talk about campaign strategy, and the DNCs approach to creating a major common narrative.
That all said, suing four states, before the counting finished, because of reports you got because you incited that people should go out there an look for something fishy, is way out of line also. So is announcing yourself to be the winner while none of the major news networks has declared you as such. So is championing a 'stop the vote counting' message.
edit: Correction: Suing three states (to stop the vote count), and demanding a recount in the fourth.