A few tips for Democrats in round two, understanding that this is a fundamentally different hearing:
1) Stop building up Mueller. He's already 25' tall and covered in bronze stars. Enough. If you feel it's necessary to show that he's Republican, do that.
2) Stop taking "I stand by the report" as the end of the statement. If Mueller stands by the report, he will explain what he means by a statement in the report—a statement like "another constitutional process." Press for an explanation.
3) Get across something of the scope of the Russian actions, which were much larger, most extensive, more varied, and more intense than 99% of the population realizes.