Mitt¹ Romney and the Republicans raised a combined $100m in June.

米特·罗姆尼和共和党成员在六月份联合筹到1亿美元竞选资金。

Some Republicans have criticised Mitt Romney for taking a week's holiday
The figure excludes the millions raised by independent groups that support the Republican presidential candidate.

President Barack Obama and the Democratic Party have not yet released their fundraising results for June.

Mr Obama spent the day in Ohio as he launched the first bus tour of his campaign for re-election in November.

In May, the Romney campaign out-fundraised its rival, attracting $77m against the Obama team's $60m.

'New donors²'

Mr Obama has been warning supporters that he is in danger of becoming the first sitting president（现任总统） in history to be outspent by his opponent.

According to Mr Romney's campaign aides, much of the money raised in June came from new donors, Politico reported.

Several states, including the key battlegrounds of Colorado, Michigan and Ohio, exceeded their fundraising goals, they added.

Meanwhile, Mr Obama pitched a positive message on Ohio's economic recovery and the comeback of the state's car industry.

Ohio's unemployment rate of 7.3% compares with a national average of 8.2%.

Ohio is a key battleground in presidential elections - no Republican has ever won the White House without capturing it.

A Quinnipiac University poll of Ohio voters last week had Mr Obama leading his rival by 47% to 38% in the state. Earlier, the Obama campaign had run a barrage³ of attacks on Mr Romney's business record.

"I'm betting you're not going to lose interest," Mr Obama told voters in Maumee, Ohio. "I'm betting you're not going to lose heart. I still believe in you, I'm betting on you."

The president also touched on his landmark⁴ healthcare reform act, which was upheld by the Supreme⁵ Court last week.

"It is going to make the vast majority of Americans more secure," he told supporters. Mr Romney has pledged to repeal⁶ the law if he wins office.

On Friday, Mr Obama will finish his bus tour with appearances in Poland, Ohio, and Pittsburgh, Pennsylvania.