I think there are two things to hold onto here: one, most people's voting intentions were locked in before last night, and two, there's still a long way to go before election day. The Democrats' ground game is going to be critical here - just look at what Stacy Abrams did in Georgia four years ago. Trump's railroading of the RNC means that a lot of money that normally flows down to local candidates isn't doing and if the Dems can use their financial advantage to motivate young voters out based on abortion, student loan forgiveness, climate policy and all the other things that they're clearly on the right side of the argument for, I think the Dems can still win this. There's also another debate in September and if Biden can get his shit together and perform at that more like he did at the SOTN, last night will be largely forgotten.