[Editor's note: Graduated circles are automatically sized in Flash interactive from The New York Times. I believe the circle locations are auto plotted, too, but already transformed to projected XY coordinates, not from Lat-Longs. I like the National and Cable graduated symbols in the Gulf of Mexico.]
About $300 million has been spent from April 3 to Oct. 13, 2008 to broadcast over 200 ads, according to statistics compiled by Campaign Media Analysis Group, which tracks political advertising expenditures.
Source: Campaign Media Analysis Group, a division of TNS Media Intelligence