Republican presidential candidate Mitt Romney surged ahead of President Barack Obama in fundraising for the first time last month — and a senior Obama adviser concedes that Obama will be the first incumbent president to be out-raised by his opponent.

Romney’s campaign and the Republican Party together raised more than $76 million in May, according to filings with the Federal Election Commission, while Obama and the Democrats brought in $60 million.

Obama campaign officials predict that Romney will also outdo Obama and the Democrats in June with a $100 million haul.

“I think Romney is going to continue to have big months,” an Obama campaign official, speaking on condition of anonymity, told reporters. “Combine that with the Super PAC stuff, and we are going to be the first incumbent outspent. That’s clear.”

Senior advisers in the Obama campaign told The New York Times that Romney and groups supporting him will spend $1.25 billion on television advertising.

“Republicans are betting they can win this thing on the air,” one adviser said. “Make no mistake, we will be outspent.”

On Wednesday, Romney enjoyed what campaign officials described as his single best day of fundraising yet, taking in between $6 million and $8 million during a swing through Michigan.

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