A Fifth Top Aide To McCain Resigns

"And, it does appear that over the last several weeks John McCain keeps on having problems with his top advisers being lobbyists in some cases for foreign governments or other big interests that are doing business in Washington," Obama said. "That, I don't think, represents the kind of change the American people are looking for."

Despite Obama's pledge not to take lobbyist money, he has several former lobbyists advising him, including deputy campaign manager Steve Hildebrand, who was a lobbyist for an environmental group. Spokesman Hari Sevugan said Obama lets lobbyists advise him but not take paid staff positions.

Loeffler, a former congressman from Texas, is a close friend of McCain's and took over the campaign's fundraising last summer. He did not respond to e-mails or a message left on his office voice mail yesterday.

Newsweek reported that his firm, the Loeffler Group, had collected $15 million from Saudi Arabia and millions more from other foreign governments. He is listed as chairman and senior partner at the firm.

Rogers declined to comment about Loeffler or to say whether other aides are likely to resign. Davis and Black have not given any indication they intend to leave.

Staff writer Matthew Mosk in Milwaukie, Ore., contributed to this report.