The Ides of March star will welcome U.S. President Barack Obama and 150 of his supporters at his residence on 10 May (12), with guests paying almost $40,000 (£25,000) per ticket in a bid to raise money for Obama's re-election campaign.

All proceeds will be donated to the Obama Victory fund, and Clooney is offering two fans a chance of attending the dinner if they make a donation to the campaign.

The minimum donation for the raffle is $3 (£1.80) and is only open to those eligible to vote for the upcoming U.S. election.