Mr. Romney and the Republican National Committee took in $101.3 million in July, his campaign announced Monday, as Republican donors rallied behind their presumptive nominee with the national convention only a few weeks away. The president’s campaign announced on Twitter on Monday morning that his July fund-raising with the Democratic National Committee topped out at about $75 million — the third month in a row they have brought in less than the Republicans. Mr. Obama’s team appears to have all but conceded the money race, deluging the president’s grass-roots supporters this summer with fund-raising e-mails and warning supporters of the financial advantage that the Republicans will hold going into the final months of the campaign. “Make no mistake, we will be outspent,” a senior campaign official said during a conference call with reporters last month. More detailed information about the July fund-raising, including how much the candidates themselves raised and how they spent their money, has not yet been released by the two candidates. All campaigns are required to report their fund-raising to the Federal Election Commission by Aug. 20. But the Republican figure keeps Mr. Romney and his party on pace to bring in $800 million for the cycle, the target set by Mr. Romney’s team in April. Roughly a quarter of the Republicans’ haul, $25.7 million, came in donations under $250, as Mr. Romney worked to increase his appeal among small donors. “Americans are clearly looking for a change in the White House,” Reince Priebus, the chairman of the R.N.C., said in a statement. “While President Obama claims that his economic plan ‘worked,’ the American people know that his policies haven’t worked and he has failed to fix our economy.” Because Mr. Obama easily outraised Mr. Romney all of last year and early this year, the president does not need to beat Mr. Romney in the months ahead to bring in the roughly $750 million his team has said they wish to raise in this cycle. But heavy spending on field organizers, technology and advertising — more than $400 million through the end of June — appears to have cost Mr. Obama the impressive cash advantage he once had. And Democratic-leaning “super PACs” have raised far less money than their Republican counterparts, forcing Mr. Obama to spend heavily on attack advertisements against Mr. Romney, even while conservative groups pummel him on the airwaves. The Republicans have used the cash surge of the last two months to begin trying to match Mr. Obama’s field advantage, opening about 250 offices around the country, recruiting volunteers and hiring more than 600 staff members for the fall campaign. On Saturday, the R.N.C. announced that organizers had made their one millionth voter contact of the election cycle. The committee has also begun running general election advertisements, as Mr. Romney began doing in May. The campaign, the Republican National Committee and a joint fund established by the Republicans to raise presidential campaign cash ended July with $185.9 million in cash on hand. They did not disclose what part of the money would end up in Mr. Romney’s campaign coffers, which can accept only $5,000 from each donor every election cycle, and how much would go to the R.N.C., which can accept more than 10 times that amount from each donor. Mr. Obama did not disclose how much money his campaign and the D.N.C. have on hand. The strong fund-raising puts renewed pressure on Mr. Obama to bring in more cash and suggests certainty that Mr. Romney will remain financially competitive with an incumbent whose fund-raising prowess has long been a hallmark. Underscoring the campaign’s changed fortunes, Mr. Obama’s campaign is no longer announcing its fund-raising totals in lush videos featuring his senior staff or field workers. Instead, on Monday, not long after Mr. Romney made his announcement, Mr. Obama’s campaign put out its total in a brief message to his Twitter followers, thanking them for their money. “Every bit helps,” the campaign wrote.