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WASHINGTON -- Less than 7% of the money Republican Mitt Romney raised for his presidential campaign in April came from people who had donated to one or more of his rivals, suggesting that some of his party's conservatives have not quickly embraced him as the party's standard-bearer.

Of the $11.7 million that flowed into Romney's main campaign account last month, $761,000 came from people who previously donated to one of his seven major rivals and wrote their first campaign checks in April to aid the former Massachusetts governor, a USA TODAY analysis shows.

Just 150 of the nearly 20,000 people who donated more than $200 to former Pennsylvania senator Rick Santorum, for instance, have contributed to Romney, the review found. Santorum, a favorite of social conservatives, dropped out of the contest in April and endorsed Romney earlier this month.

The $11.7 million that flowed to Romney for America represents a drop of about $1 million from his fundraising the previous month and less than half of President Obama's fundraising haul in April.

Romney's fundraising total doesn't include money he has started to raise jointly with national and state party committees since becoming his party's presumptive nominee. His campaign said those efforts yielded $40.1 million last month, an amount that put him on near-parity with Obama and the Democratic Party in April.

Romney's main joint-fundraising committee won't file details on its fundraising and contributors until July.

Not counting party fundraising, Obama raised $25.7 million in April - about $10 million less than his March haul.

Overall, Romney has raised $100.4 million in his main campaign account since kicking off his presidential campaign last year, compared with Obama's $233.5 million.

Donations to a pro-Romney super PAC, meanwhile, dropped dramatically. Restore Our Future raised $4.6 million in April, $4 million less than it collected in March, when it ran hard-hitting ads in early-voting states to fend off Romney's primary challengers.

Despite its dip in fundraising, the pro-Romney Restore Our Future super PAC ended the month with more than $8.2 million in cash reserves to help Romney in the general-election battle.

Super PACs can raise and spend unlimited money from corporations, unions and corporations as along as they don't coordinate their activity with candidates.

The single-largest donor to Restore Our Future in April: Texas investment manager John Kleinheinz, who gave $1 million. Harold Hamm, the CEO of Oklahoma-based petroleum producer Continental Resources Inc., gave $985,000. Texas home builder Bob Perry gave $750,000 to the super PAC.

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