Mitt Romney's finance filing for August shows evidence of a campaign struggling to keep pace with President Obama's as the result of a quirk in election law.

Romney raised $66.6 million and spent $66.4 million last month, according to federal election records.

But the campaign also borrowed $20 million, a loan necessitated by election rules that did not allow Romney to access his bountiful general election fund until officially accepting the Republican nomination.

The Romney campaign said earlier this week that it had borrowed the money against money they already had in the bank for the general election — a practice allowed under federal election law. The campaign said they had already paid back a chunk of the loan, and should easily be able to repay the remainder now that they have access to their full fundraising haul.

According to the reports, Team Romney spent $13.7 million on television advertising and an additional $3 million in online advertising throughout the month. The campaign also spent nearly $12 million on direct mail targeting swing-state voters, and another $3 million on telemarketing.

Paid strategy and communications consultants cost the Republican nominee $3.25 million, nearly identical to the amount spent on campaign staff. The campaign also spent more than $4 million on travel expenses.

Further evidence that the Romney campaign was under strain because of the restrictions on pre-convention spending was evident in the filings of the leading pro-Romney super-PAC, Restore Our Future, which spent a staggering $21.2 million in August to help Romney keep pace with Obama's reelection ad spending.

That's more than three times the $7 million it raised in August — itself a considerable step back from a record $20.7 million raised in July. Restore our Future ended the month with just $6.3 million cash on hand.