So Wisconsin has 55 offices, Michigan 23 (Hillary), and Arizona only 3, Georgia 5. If so, the campaigns are anticipating a much tighter race than some of the conventional wisdom.
Not necessarily. Keep in mind that offices aren't fluid things that can be opened and organized within an instant. Neither campaign wants an inefficient allocation of resources assuming the race is tight, which is the case in which efficiency matters most. Considering this, it makes sense to invest heavily in tipping-point states even if they don't appear to be swing states at this point -- better than scrambling if the race does tighten.
