Politicians, including prominent Republicans, have called for the study to be released.
In a new study to be released in January, the center found more than 1,000.
The study to be released on Wednesday is a follow-up to the 1988 report.
The findings are contained in a "case study" to be released Tuesday.
The study, to be released today, is based on a search of state and federal court records.
The study, to be released on Wednesday, was financed by the Ford, Joyce, Haynes and Russell Sage Foundations.
They are not even all Howard Dean supporters, according to a study to be released today by George Washington University.
A study to be released shows that the financial community is the top industry among the president's fund-raisers.
According to a study to be released today by the Pew Internet and American Life Project (www.pewinternet.org), an estimated 68 million Americans have used government Web sites.
Ms. Gibbs, the executive director of the Center for Health, Environment and Justice, a nonprofit organization in Washington, helped organize the study to be released today.
Its study, to be released today, shows that 20percentt now come from the financial sector, up from 14percentt in the last presidential election.
