Other celebrity attendees should include singer Barbra Streisand and studio executive Jeffrey Katzenberg, according to the Wall Street Journal. For anyone not lucky enough to win the contest, the price of attendance is a $35,800 donation to the Obama campaign and Democratic National Committee.

Clooney has been a frequent fundraiser and guest of the Obamas. Last month, he attended the state dinner at the White House for British Prime Minister David Cameron.

Mitt Romney has also raffled off the opportunity to spend time at a special event to donors. Earlier this week, Romney invited two contributors to his campaign to join him and family members at the Boston Red Sox Patriot's Day game at Fenway Park.