Why won't Romney reveal his bundlers?

“The one danger is if Romney has a questionable bundler, you know, somebody with a troubled legal history,” says Bill Allison, editorial director of the Sunlight Foundation, which advocates for transparency in government and politics.

Bundlers who carry political baggage have shown up along the campaign trail before — like Norman Hsu, a Ponzi scheme artist and onetime bundler for Hillary Clinton’s 2008 campaign, or Jack Abramoff, the lobbyist who pleaded guilty to corruption charges after bundling for Bush in 2004.

“If that kind of story comes up, the question becomes about Romney is, ‘Who are his other bundlers, and what is he hiding?’ ” says Allison.

And here’s another reason to disclose: The public recognition can actually make the bundlers more enthusiastic and competitive.