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While an analysis of daily totals of contributions of more than $200 — the only ones disclosed — shows Mr. Obama’s supporters giving continuously, Mr. Romney’s daily totals peak and wane abruptly in concert with fundraising events, showing his reliance on hard-sell appeals for funds at dinners.

In modern campaigns, however, major national events are also used as fundraising pegs. Hours after the Supreme Court upheld Mr. Obama’s signature health care legislation, both campaigns sought to capitalize on the moment financially.

“Obamacare is bad medicine, it is bad policy, and when I’m President, the bad news of Obamacare will be over. Donate $10 or more,” an email from Mr. Romney said. “My opponent said a short while ago that the first thing he would try to do as president is repeal the health care law,” Mr. Obama countered before asking for a donation.

When it came to medical professionals themselves, the sentiment seemed to be in Democrats’ favor. Doctors responded by giving $600,000 to Mr. Obama and $210,000 to Mr. Romney from the June 28 ruling to June 30, while nurses and other support staff gave $130,000 to Mr. Obama and $25,000 to Mr. Romney, The Times’ analysis showed. Those proportions mirrored the professions’ preferences throughout the month.

But in the end, among the general populace, Mr. Romney raised an almost identical amount June 29, $37 million, as Mr. Obama did June 30, $38 million.

Much of the money raised by Mr. Romney was funneled to companies controlled by longtime confidants: $12 million to the firm of Romney senior advisers including Stuart Stevens; $7.3 million on direct mail to SCM Associates, run by Stephen C. Meyers, another longtime Romney associate; and $832,000 to SJZ LLC, a company run by Spencer J. Zwick, the campaign’s chief fundraiser.

The total raised by Mr. Romney this election cycle is $12 million more than that of Sen. John McCain at this point in his 2008 run.

In addition to his marked expansion of a network of small donors, he had help from Washington insiders. Twenty-three federal lobbyists have now worked at raising money for Mr. Romney’s campaign. Mr. Obama, like previous presidential candidates, voluntarily disclosed his bundlers, but Mr. Romney has declined to do so, except for lobbyists, which rules require.

The Romney and Obama campaigns did not respond to requests for comment.