McCain groused about Obama mixing it up with celebrities. He told a rally in Vienna, Ohio, on Tuesday that Obama "talks about siding with the people, siding with the people just before he flies off to Hollywood for a fundraiser with Barbra Streisand and his celebrity friends. Let me tell you my friends, there's no place I'd rather be than here with the working men and women of Ohio."

US Republican presidential nominee Senator John McCain (R-AZ) speaks at a rally in Vienna, Ohio September 16, 2008. [Agencies]

A night earlier, McCain was with deep-pocketed donors in Florida and raised $5 million, a fact noted by Obama's campaign.

"I don't know who showed up down in Florida where he raised $5 million but my guess is that it wasn't a lot of nurses, firefighters and police officers," Obama's senior strategist, David Axelrod, told reporters. "The whole corporate lobbying community is rallying to his side. We're going to have to struggle to keep pace. You can't challenge that group and not expect them to have a lot of money."

While the final total was not determined, Obama's campaign did not dispute estimates that the twin events would bring in $9 million for Obama and the Democratic Party. That would be his second-biggest, fundraising day. Obama received $10 million from online donors the day after McCain's running mate, Alaska Gov. Sarah Palin, delivered her speech at the Republican convention.

On another big fundraising night in California, Obama raised $7 million in August in San Francisco.

Obama is financing his presidential race with private contributions after abandoning a pledge to take public financing capped at $84 million. His campaign announced Sunday it had collected $66 million in August, a fundraising record for any presidential candidate in a monthlong period.

By comparison, McCain raised $47 million in August, a personal best for his campaign as well. After claiming the Republican nomination, McCain accepted the $84 million in taxpayer funds allotted by the public financing system for the race.