Sadly, Trump supporters don't care that he lies. And most of what he said tonight was pure falsehood. But these sorts of debates aren't about what is said -- they're about the visuals (welcome to the electronic age; once upon a time, people could read transcripts of debate and actually know what the candidates said). Biden's age showed far more than I (and probably his party) had hoped. He is old -- and it shows. Trump looked younger and more vibrant -- which only made his lies more believable to his minions.
I don't know if there will be another debate after this, but it should be interesting to see how Biden does for his speech at the convention.