Former Tennessee Congressman Harold Ford Jr. Considers Senate Run in New York

Mr. Ford, 39, who moved to New York three years ago, has told friends that he will decide whether to run in the next 45 days. The discussions between Mr. Ford and top Democratic donors reflect the dissatisfaction of some prominent party members with Ms. Gillibrand, who has yet to win over key constituencies, especially in New York City.

About a dozen high-profile Democrats have expressed interest in backing a candidacy by Mr. Ford, including the financier Steven Rattner, who, along with his wife, Maureen White, has been among the country’s most prolific Democratic fund-raisers.

“Maureen and I worked hard for Harold in his last race because we think the world of him,” Mr. Rattner said, referring to Mr. Ford’s run for the Senate in Tennessee in 2006. “He has extraordinary drive and intelligence and will excel at anything that he chooses to do.”

Among those who have encouraged Mr. Ford to consider a run are Merryl H. Tisch, the chancellor of the New York State Board of Regents, whose husband, James, is the chief executive of the Loews Corporation, and Richard Plepler, the co-president of HBO, according to people who have spoken with them.

Mayor Michael R. Bloomberg, who has publicly tangled with Ms. Gillibrand, is open to the possibility of supporting a challenger of Mr. Ford’s stature, according to those familiar with his thinking.