The largest share of insurrectionists came from large-population counties that Biden won.
[From the report, pp.19-20]
Overall, the Biden counties versus the Trump counties that produced insurrectionists [but not the insurrectionists themselves] are more unemployed, more mixed race, and far more big city…
Most important, the more Trump voters in a county – even in counties Biden
won – the greater likelihood that county would send an insurrectionist to the
US Capitol.
[from the report, p. 30]
Given the political geography of the movement, President Biden may well get
the most violent resistance from where he is politically the strongest.