Everyone seems to have a pet explanation for why John McCain's campaign is tanking. But the fact is that Barack Obama's campaign has massively outspent the Republican in TV advertising over the past month. Here are the TV ad amounts in four swing states during the week of Sept. 28-Oct. 4:

Pennsylvania:

• Obama -- $2.2 million
• McCain -- $1.6 million

Ohio:

• Obama -- $2.2 million
• McCain -- $1.7 million

Florida:

• Obama -- $2.2 million
• McCain -- $659,000

Virginia:

• Obama -- $2.1 million
• McCain -- $547,000

In those four states (with a combined 81 Electoral College votes), Obama's $8.7 million TV ad expenditure is 93% larger than McCain's $4.5 million....