Lobbyists at Johnson, Madigan, Peck, Boland & Stewart  whose partners include another former aide in the Clinton White House, Bill Danvers  have separately met with pro-business Democrats like Representative Joseph Crowley of New York. And Andrew Samet, a deputy secretary of labor in the Clinton administration, has been hired under yet another lobbying contract.

Mr. Penn got into trouble last week after he attended a meeting with Colombia government officials, as they prepared for the move by Mr. Bush to force a debate in Congress. His firm had been representing the Colombian government since last April, helping it promote the deal with news media, among other tasks.

But Mr. Penn, a strategist and pollster, ended up getting blasted by both sides. The Colombian government canceled the contract with his firm after he called the meeting an “error in judgment.” Mr. Penn then stepped down from his campaign post after Mrs. Clinton was criticized for having a close adviser lobbying for a pact she opposed. Mr. Penn’s advocacy was particularly awkward because Mrs. Clinton increasingly has taken a stance opposing free trade during her campaign.

The ties between the lobbying firms and the Clinton campaign illustrate the complexity of Washington’s political world, where players are often switching positions or playing multiple roles. While Mr. Wolfson has taken a leave from Glover Park, for example, he still has equity in the firm valued at $500,000 to $1 million, according to a disclosure form.

Image Susan C. Schwab, the United States trade representative, on Sunday with President Álvaro Uribe of Colombia in Cartagena. Ms. Schwab led a Congressional delegation to Colombia. Credit... Cesar Carrion/Agence France-Presse — Getty Images

A long list of former Clinton administration aides, including Mack McLarty, the former counsel to the president; Donna E. Shalala, the health and human services secretary; and Leon E. Panetta, the onetime chief of staff, also have come out in support of the deal. It puts them in alliance with Mr. Bush and Republican leaders.

Besides the Colombian government, the Bush administration has perhaps been the most forceful player in the fight, holding more than 400 meetings or telephone conference calls with officials on Capitol Hill to push the deal, the president said Monday. It has also paid most of the cost of the Congressional delegations, although an administration spokesman said on Monday that he could not estimate what the tab for these trips had been.