Obama's daily spending on campaign ads is four times more than McCain's  US $ 4.5 million to 1.5 million  an analysis by TNSMI-Campaign Media Analysis Group said.

In their last and final presidential debate on Thursday, McCain, the 71-year-old Senator from Arizona had accused Obama of "spending unprecedented--unprecedented in the history of American politics."

Obama is now on track to spend over US $ 110 million on campaign commercials in October, an outstanding sum that does not include payment for the 30-minute network prime-time ads scheduled to air six days before election day.

Obama's spending translates into about 7,700 airings of campaign commercials each day, more than double the 3,600 ads being run by McCain, who is trailing in almost all national opinion polls ahead of the November 4 general election.

Obama, 47, a first-time senator from Illinois, who aspires to be the first black-American president, is on the air nationally, on network and cable, buying ads on NFL football games, soap operas and in prime-time, CNN reported.

Obama is expected to spend between US $ 1 million and 1.5 million on the 30-minute campaign commercials that will air on CBS, FOX and NBC on October 29, projects Evan Tracey, CMAG's chief operating officer.

"This is more than just a message imbalance," Tracey said. "This is, in media terms, a rout. John McCain is in a shouting match against a guy with a megaphone."