The Senate is pie-in-the-sky until 2022. Only a massive Blue Wave will flip it in November.
I don't think its as far-fetched as you might think...
There are 3, maybe 4 republican-held seats that could potentially be flipped (and one Democratic seat that will probably turn republican...).
The Democrats are likely to lose their seat in Alabama (unless something strange happens, like republican infighting during the primaries somehow sabotages their candidate).
On the other hand, the republicans have to worry about:
- Maine: Susan Collins has one of the highest disapproval ratings (due in large part to her support of Kavanaugh)
- Arizona: The current republican senator was an appointee, after having lost in her previous election attempt, and she has trailed in all recent polls
- Colorado: They have a republican senator, but the state went for Clinton in 2016 (and the current incumbent is trailing in recent polls)
There is even a chance that they could win North Carolina (the state went for Trump in 2016, but the polls seem to be split between the Republicans and Democrats). Heck, even Montana (normally a solid republican state) is seeing the Republican incumbent trailing the Democrats.
And of course even if they end up in a tie, if they also win the white house then the VP becomes the tiebreaker.
(Wiki)
Granted, I think its an outside chance (and I've certainly been disappointed before)... but its certainly not a 'pie in the sky' chance.
So let's focus on getting the White House, because if you don't get that, you won't get the Senate, either, and the takeover of the Judiciary will continue.
On the other hand, if they win the white house but don't take the senate, obstruction by senate republicans will continue. I wouldn't even put it past Moscow Mitch to block any judicial nominations from a Biden administration for the next 2 years.