The whole thing is political kabuki theater, the libs will all take their turn asking Mueller carefully framed accusations in the form of questions, none of which Mueller will be able to answer but the inability to answer will be seen as proof by the left.
Likewise the pub’s will grill Mueller on his knowledge of when he knew this or that, none of which Mueller will answer but the inability to answer will be seen as proof and culpability by the right.
Both sides will use the debacle to stoke the flames and feed their constituents.
Imho, the dems will gain a notch or two if only for a short time by refocusing the narrative off their political suicide squad and on to anything else.