Mr. Romney’s campaign announced that it brought in $14 million in contributions for the second quarter, and that the former Massachusetts governor had personally lent his campaign $6.5 million. Those donations to his campaign represented a drop from the $20 million he raised in the first three months of the year.
Mr. Giuliani’s campaign raised $17 million from April through June, a slight increase from the $16 million that the former New York City mayor raised during the first quarter, when his fund-raising was just getting started after the announcement of his candidacy.

The overall figures show the Republicans trailing the top Democratic presidential candidates, Senator Hillary Rodham Clinton of New York and Senator Barack Obama of Illinois. Mr. Obama raised $32.5 million from April through June, while Mrs. Clinton raised $27 million.

The presidential campaign of Senator John McCain, the Arizona Republican who once seemed poised to be his party’s nominee in 2008, acknowledged yesterday that it was in a political and financial crisis as a drop in fund-raising forced it to dismiss dozens of workers and aides and retool its strategy on where to compete.

The campaign said the decline in contributions had left it with $2 million. It said it had raised just $11.2 million over the last three months, despite Mr. McCain’s promise to do better than his anemic $13 million showing in the first three months of the year.

Mr. McCain’s advisers blamed his close association with the recently defeated immigration bill, which was strongly opposed by conservatives already skeptical of his ideological credentials. But he has also had to contend with a host of other issues, including his support of the Iraq war, opposition from evangelical voters, the prospect of former Senator Fred D. Thompson’s entry into the race, and the sense that his continuing struggles to raise money were consuming the campaign and making fund-raising even more difficult.

Senator Barack Obama raised at least $32.5 million from April through June, he announced Sunday on his campaign Web site, attracting more than 258,000 contributors since entering the Democratic presidential race nearly six months ago.

As candidates tabulated how much money they raised in the year’s second quarter, Mr. Obama, of Illinois, appeared to be leading contenders from either party, raising at least $31 million for the primary campaign alone. Senator Hillary Rodham Clinton, Democrat of New York, raised about $21 million for the primary, a spokesman confirmed Sunday, and about $27 million over all.

“Together, we have built the largest grass-roots campaign in history for this stage of a presidential race,” Mr. Obama said, adding that 154,000 new donors had signed on in the last three months. “That’s the kind of movement that can change the special-interest-driven politics in Washington and transform our country. And it’s just the beginning.”

Mr. Obama waited barely 12 hours after the fund-raising period closed to trumpet his success, a quarterly record for a Democratic candidate, hoping to depict widespread support for his campaign and to rebut suggestions that his candidacy is falling behind Mrs. Clinton’s.