WASHINGTON - Restore Our Future, an outside "Super PAC" backing US Republican presidential hopeful Mitt Romney, raised $3.9 million in April, less than half the haul it collected in March, the group's financial disclosures showed on Sunday.

But the "super" political action committee still emerged with $8.2 million in cash on hand at the end of last month - more than it did in March - after spending $2.9 million, according to the filing with the Federal Election Commission.

In March, the deep-pocketed Super PAC brought in $8.7 million and had $6.5 million left in cash on hand.

Restore Our Future has become a formidable force in Romney's effort to defeat US Democratic President Barack Obama in the Nov. 6 election.

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