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It’s the second month Mr. Romney has topped the president, after outraising him $77 million to $60 million in May. In April, the president outpaced Mr. Romney by about $3.5 million.

While the Republicans hailed the June numbers as a sign of a growing fundraising juggernaut, Democrats urged their supporters to step up their contributions.

“This is no joke,” said Ann Marie Habershaw, chief operating officer for the Obama campaign, on its official website. “If we can’t keep the money race close, it becomes that much harder to win in November.”