An interesting article about the huge Obama ad spend -- and how McCain's ads are nearly all negative:

Senator Barack Obama is days away from breaking the advertising spending record set by President Bush in the general election four years ago, having unleashed an advertising campaign of a scale and complexity unrivaled in the television era.

With advertisements running repeatedly day and night, on local stations and on the major broadcast networks, on niche cable networks and even on video games and his own dedicated satellite channels, Mr. Obama is now outadvertising Senator John McCain nationwide by a ratio of at least four to one, according to CMAG, a service that monitors political advertising. That difference is even larger in several closely contested states...

...The most recent analysis of the presidential advertisements by the University of Wisconsin, based on the period from Sept. 28 through Oct. 4, found that nearly 100 percent of Mr. McCain’s commercials included an attack on Mr. Obama and that 34 percent of Mr. Obama’s advertisements, which were more focused that week on promoting his agenda, included an attack on Mr. McCain.

That finding reflected the McCain campaign’s strategy of trying to make Mr. Obama an unacceptable choice in the eyes of undecided voters and Mr. Obama’s goal of making undecided voters comfortable with him.

But the Wisconsin Advertising Project says that since Mr. Obama wrapped up the Democratic nomination in June, 54 percent of Mr. McCain’s advertisements have been completely focused on attacking him, roughly a quarter have mixed criticism of Mr. Obama with a positive message about Mr. McCain, and 20 percent have been devoted solely to promoting Mr. McCain.

In the same period, the study found that 41 percent of Mr. Obama’s advertisements had been devoted solely to attacking Mr. McCain, one-fifth mixed criticism of Mr. McCain with a positive message about Mr. Obama, and 38 percent were solely devoted to promoting Mr. Obama.

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Nearing Record, Obama’s Ad Effort Swamps McCain

By JIM RUTENBERG

www.nytimes.com/2008/10/18/us/politics/18ads.html

PHILADELPHIA — Senator Barack Obama is days away from breaking the advertising spending record set by President Bush in the general election four years ago, having unleashed an advertising campaign of a scale and complexity unrivaled in the television era.