Vast sums have been spent on TV advertising, mostly cancelling each other out
Mr Obama has also spread his ads more widely, with a bigger share appearing on
cable channels. That allows more careful targeting of specific groups of voters
with tailored messages: housewives via daytime soaps and cooking shows, for
example, or Hispanics via Spanish-language channels. Mr Romney’s campaign has
followed a more conventional model, with more ads aired during news programmes,
and less variation in their scripting
