In 2007, it retained Zehra Buck, a former aide to Representative Bennie Thompson, Democrat of Mississippi and a caucus member, to help expand a lobbying campaign. Its trade association in 2008 became the exclusive sponsor of an annual caucus foundation charity event where its donated televisions, computers and other equipment were auctioned, with the proceeds going to scholarships. It donated to the campaigns of at least 10 caucus members, and to political action committees run by the caucus and its individual members.

It also encouraged member stores to donate to personal charities run by caucus members or to public schools in their districts. Mr. Clay, the Missourian, received $14,000 in industry contributions in 2008 for the annual golf tournament his family runs in St. Louis. The trade association also held a fund-raising event for him in Reno, Nev.

“I’ll always do my best to protect what really matters to you,” Mr. Clay told rent-to-own executives, who agreed to hold their 2008 annual convention in St. Louis, his home district. Mr. Clay declined a request for an interview.

On a visit to Washington, Larry Carrico, then president of the rent-to-own trade association, offered to donate computers and other equipment to a nonprofit job-training group in Chicago named in honor of Mr. Davis, the Illinois congressman who in 2002 voted in favor of tough restrictions on the industry.

Mr. Davis switched sides. Mr. Carrico traveled to Chicago to hand over the donations, including a van with “Congressman Danny K. Davis Job Training Program” painted on its side, all of which helped jump-start a charity run by Lowry Taylor, who also works as a campaign aide to Mr. Davis.

In an interview, Mr. Carrico said support from caucus members came because they understood that his industry had been unfairly criticized and that it provided an important service to consumers in their districts.

While some caucus members still oppose the industry, 13 are co-sponsors of the industry-backed legislation that would ward off tough regulatory restrictions  an alliance that has infuriated consumer advocates.