The McCain and Obama presidential campaigns continue to spend massively in the three Southern swing states, Florida, North Carolina and Virginia.

The Wisconsin Advertising Project reports that the two campaigns spent $28 million on TV ads over the last week -- $17.5 million for Obama, $11 million for McCain.

The numbers show the Obama campaign banking heavily on turning at least one of the Southern states: Florida, Virginia and North Carolina were the 2nd-, 4th- and 6th-biggest recipients, respectively, of Obama's TV ad dollars.

McCain, on the other hand, is investing more in the Midwest and Colorado -- although the McCain camp recently admitted it was pulling out of Michigan, the state that ranked 3rd for McCain's TV dollars last week.