I doubt we’re gonna see such a disparity between Biden and down ballot Dems on Election Day. Their numbers will probably converge at some point by then.
Be careful what you wish for. More likely that downballot converges on the presidential numbers than vice versa.
I can see specific popular incumbents like Baldwin (who ran ahead of Wisconsin Democrats in general in 2018) or Casey over-performing, but I continue to really doubt that congressional Republicans taken as a whole will run behind Trump.