I’d probably wait until November 6 to arrest him. You really don’t want a public indictment to do the work his dumb criminal scheme couldn’t.

You need to loudly assert /pre-election/ that vote-buying is illegal, even if you don't reference him specifically or charge it first, because you need to have the space /post/-election that the charges are because it was plainly illegal, not that you're clear of the election now so can "clean up"

Calculus changes if he further escalates the crimes though