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She said CoDA sought to “harness the financial resources as well as the brains and the energy of the progressive sector.”

Taking part in the presentation was Rob Stein, founder of the Washington, D.C.-based Democracy Alliance, who said CoDA’s successes could be replicated in 12 to 15 other states by 2010. Democracy Alliance was formed in 2005 with backing from billionaire international financier George Soros, who spent $13 million in an unsuccessful bid to defeat Mr. Bush in 2004.

CoDA members are expected to make multiyear commitments, pledging up to $400,000 annually to recommended progressive groups and up to $25,000 each year to fund alliance operations. During the Denver presentation, Mrs. Zeller said CoDA was “firmly focused” on trying to grow its “membership base” of wealthy donors.

In Denver, Mrs. Zeller said CoDA does not release information on its members in an effort to “remain effective and agile.” She said the group wants to be “discreet about our efforts,” and added that there is a “playbook here that you don’t want to leave on the table in a Starbucks.”

With an estimated net worth of $1.9 billion, according to Forbes magazine, Mrs. Stryker is widely credited as one of CoDA’s founders and has given $98,000 to Democratic candidates and committees in the 2008 election cycle, federal records show. Mr. Gill also donated $98,000 to Democrats this year, while Mr. Bridges has given $24,750 to Democratic candidates and committees, Federal Election Commission records show.

Dick Wadhams, chairman of the Colorado Republican Party, said that although he has seen fewer ads attacking candidates during this election cycle, they appeared to be “highly coordinated.”

He attributed the drop to 18 pending Colorado ballot measures and a backlash from the release of the DelPapa media plan.

Mr. Wadhams also said that while CoDA’s activities “haven’t crossed the line legally … they’re getting close to it.”