CHICAGO (CBS) — President Obama’s key re-election fund-raisers are being asked to come up with some big bucks and fast.

Top Democratic fund-raisers met in Chicago Wednesday with Obama campaign manager Jim Messina.

One donor said they’re being asked to raise $60 million by the end of June and that most of the money has already been raised.

Obama raised $750 million in 2008, and his advisers have privately told donors they hope to exceed that number.

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There’s also an emphasis on low-dollar fund-raising, like in 2008.

Some supporters have committed to matching smaller amounts given by first-time donors.

By some estimates it could be a billion dollar re-election effort.

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