And on Thursday, Republican aides are to meet with the Leadership Conference on Civil Rights, a lobbying coalition of 185 groups.

The institute scrupulously avoids lobbying, refusing to join tobacco-control lobbying coalitions or even to sign letters to Congress.

He said the public would then see "big lobbying coalitions bringing people together" so that an incumbent senator could raise $100,000 in one hour.

To members of the lobbying coalition, who believe that the widespread use of stock options enhances entrepreneurship and advances economic growth, it is a victory.

This summer, a lobbying coalition called the Campaign to Keep Travel Competitive estimated that families were paying more than 14 percent in assorted taxes.

Organized labor, for example, has been pressing financial services companies to quit the business-heavy lobbying coalitions that back Mr. Bush's plan.

"They are big givers, heavy hitters, a huge and powerful lobbying coalition," Mr. Wellstone said.

The American Energy Alliance, a lobbying coalition with more than 1,000 member organizations, was formed this spring to fight it.

This irks some consumer advocates in Washington, who have complained that the organization ignores important safety issues, refuses to lend its support to some lobbying coalitions and is too conservative.

"Yes, we need more money," said Jeffrey W. Levi, director of government affairs at the AIDS Action Council, a lobbying coalition.