CNN.com wrote:

The party featured a man wearing a George Bush mask and a flight suit, a group called Billionaires for Bush and a team of four known as the Super Zeroes: "Enron Ed," "Halle Burton," "Miss Leader" and "The Uncredible Hulk."

According to Rebecca Rubins, who masqueraded as "Miss Leader," the Super Zeroes are Democratic Party volunteers who appear at events around the country, especially in battleground states, "to put the word out about the Bush administration."...

...Billionaires for Bush, whose members were decked out in top hats, tails, evening gowns and tiaras, bills itself as a grassroots media campaign seeking to sway voters in swing districts.

According to Guen Donohue, in costume as Hanna O'Verfist, they're a group of comic actors dressed in evening clothes who use humor, street theater and creative media to "show how Bush's economic policies benefit the corporate elite."