Democrat Barack Obama and Republican John McCain together spent $94 million in August, a record spree mostly aimed at about a dozen states that will probably decide their historic presidential contest.

Their campaign finance reports, filed before Saturday’s midnight deadline, shows that more than half of their $3-million-a-day spending rate was devoted to advertising that became increasingly negative during the month.

Both men had their personal best fundraising months. Obama raised $65 million and McCain raised $47.5 million, their reports show. Obama ended the month with more than $77 million in the bank; McCain ended with $27 million.

Unlike Obama, McCain is accepting $84 million in public money for the remaining two months of the campaign. That means he can’t keep his surplus cash and has turned it over to national and state Republican party committees that can assist him in the fall.

McCain’s fundraising included more than $9 million raised in the three days after he announced his selection of Alaska Gov. Sarah Palin as his running mate on Aug. 29.

McCain spent about $23 million on advertising, his highest as he jockeyed for position against Obama in battleground states. Obama vastly outspent him – about $33 million – as he practically matched McCain’s advertising in several key states and tried to expand his field to typically Republican-voting states such as Alaska and Georgia.

Obama has since pulled out of those two states, but has continued to have an ad presence in GOP-leaning states such as Montana and North Dakota. He and McCain are also competing in the previously Republican territory of Virginia and North Carolina.

McCain increased his staff spending, building up a payroll of nearly $1.2 million. He also spent more than $3 million on travel, at least twice as much as what he spent in July.

Obama, however, was ahead of him in those categories as well. Obama spent about $2.8 million on payroll, an increase over his July spending. He also spent nearly $4.9 million on travel.

In a report filed Saturday, Sen. Hillary Rodham Clinton showed only $1.8 million in donations in August, despite Obama’s appeal to his top donors to help his Democratic primary rival retire her debt. She still owed about $9 million to her campaign vendors. Clinton loaned her campaign nearly $13.2 million. Under campaign finance laws, now that Obama is officially the party nominee, she can only raise money to recoup $250,000 of that loan.

Clinton refunded donors $16.7 million in contributions she received for the general election – money she could not use to pay her primary debts. She also transferred $6.5 million in general election funds to her Senate re-election committee.