A successful nationwide presidential campaign of polling, organizing, ad spending, and visits, with every voter equal, would be run the way presidential candidates campaign to win the electoral votes of closely divided battleground states, such as Ohio and Florida, under the state-by-state winner-take-all methods. In the 4 states that accounted for over two-thirds of all general-election activity in the 2012 presidential election, rural areas, suburbs, exurbs, and cities all received attention — roughly in proportion to their population.
The itineraries of presidential candidates in battleground states (and their allocation of other campaign resources in battleground states, including polling, organizing, and ad spending) reflect the political reality that every gubernatorial or senatorial candidate knows. When and where every voter is equal, a campaign must be run everywhere.
With National Popular Vote, when every voter is equal, everywhere, it makes sense for presidential candidates to try and elevate their votes where they are and aren’t so well liked. But, under the state-by-state winner-take-all laws, it makes no sense for a Democrat to try and do that in Vermont or Wyoming, or for a Republican to try it in Wyoming or Vermont.
The main media at the moment, TV, costs much more per impression in big cities than in smaller towns and rural area. Candidates get more bang for the buck in smaller towns and rural areas.