Mr. Clinton and Chelsea Clinton have already quietly appeared at a Manhattan fund-raiser in late October, where Ms. Clinton introduced Mr. Gottheimer as something of a family member.

Thomas F. McLarty III, Mr. Clinton’s first chief of staff in the White House, called Mr. Gottheimer, who worked as a strategist for Microsoft until recently, a well-liked political lieutenant who had “paid attention to relationships” in the Clinton orbit over the years.

“He’s running very much as a pro-business, centrist Democrat, in the New Democrat philosophy,” Mr. McLarty said.

Mr. Gottheimer, a close associate of Mark Penn, the former campaign strategist for both Clintons, is widely seen as a dependable peacemaker in a political circle often rattled by palace intrigue. And he will benefit from a close-knit network: Mr. Clinton has been a steadfast campaigner for former employees and his wife’s supporters, regularly diving into lower-profile elections, including mayoral races in Jacksonville, Fla., and Scranton, Pa., to support family allies.

But the collection of Clinton associates aiding Mr. Gottheimer is striking in its breadth.

Mr. Gottheimer reported raising around $1 million for his campaign through September. A review of his filings found that about one dollar in six came directly from fellow alumni of the Clinton White House and campaigns — many of whom are scattered across powerful companies like Time Warner Inc., Bloomberg L.P. and Goldman Sachs — or from major donors and employees of consulting firms tied closely to the Clintons.

Among his contributors were three of Mr. Clinton’s White House press secretaries; two former chiefs of staff, Mr. McLarty and Erskine B. Bowles; the campaign manager and communications director for Mrs. Clinton’s 2008 campaign; and Samuel R. Berger, Mr. Clinton’s national security adviser, who died earlier this month.