From BarackObama.com:

"Too many political fundraisers are hosted by Washington lobbyists and
filled with representatives of special interests.

But our campaign is different.

Our funding comes from a movement of more than one million supporters
like you giving whatever they can afford.

Make a donation in any amount between now and 11:59 pm EDT on Monday,
March 31st, and you could join Barack and three other supporters for an intimate
dinner for five."