Obama significantly outspent McCain on television advertising last month, $32.3 million to $18.1 million. The Republican National Committee spent another $4.7 million on broadcast ads.
McCain is outspending Obama on mail-related costs - $8 million to Obama's $4 million. The RNC spent another $6.5 million on postage and mail production, its report shows. Experts say Republicans tend to be older than Democrats and prefer mail over Internet communications.
Obama is spending far more on the Internet, $651,000 on Internet advertising, and $884,000 on Web sites. McCain and the RNC disclosed no spending specifically on online ads, and $422,000 on Web-related costs.
Like McCain, Obama received heavy support from lawyers last month - $3 million to McCain's $1.7 million.
Obama outraised McCain in the nation's banking center, New York, $2.7 million to $1.3 million.
Throughout the campaign, Obama has said he rejects the ways of Washington insiders. But he continues to out-raise McCain in the Washington-Maryland-Virginia area, $2.88 million to $2.4 million last month, and $28.5 million to McCain's $10.5 million since the campaign began.
California remains the candidates' largest source of money - $52.2 million for Obama and $17 million for McCain.
Obama's second largest source is New York, $31.3 million, compared with $8.8 million for McCain. McCain's second largest source is Texas, at $13 million. Obama has raised $12 million there.