Ad spots by television market

The presidential campaigns -- along with their allied parties and interest groups -- have focused their television advertising in media markets reaching voters in the most competitive swing states.

Florida, the biggest and most expensive battleground, has gotten the most spending. That's quickly followed by Ohio and Virginia, two medium-sized states that are among the most competitive. Iowa, Nevada, Colorado and North Carolina have seen high numbers of ads, but less spending because airtime is cheaper in areas with smaller populations.