Joseph I. Lieberman, Connecticut’s four-term United States senator and Vice President Al Gore’s Democratic running mate in the 2000 presidential election won by George W. Bush and Dick Cheney when the Supreme Court halted a Florida ballot recount, died on Wednesday in Manhattan. He was 82.

His family, in a statement, said the cause was complications of a fall. His brother-in-law Ary Freilich said Mr. Lieberman died at New York Presbyterian Hospital in Upper Manhattan.

At his political peak on the threshold of the vice presidency, Mr. Lieberman — a national voice of morality as the first major Democrat to rebuke President Bill Clinton for his sexual relationship with the White House intern Monica Lewinsky — was named Mr. Gore’s running mate at the Democratic National Convention that August, and became the nation’s first Jewish candidate on a major-party presidential ticket.

In the ensuing campaign, the Gore-Lieberman team stressed themes of integrity to sidestep Clinton administration scandals. Mr. Lieberman also urged Americans to bring religion and faith more prominently into public life. They won a narrow plurality of the popular votes — a half-million more than the Bush-Cheney Republican ticket. But on the evening of Election Day, no clear winner had emerged in the Electoral College, and an intense legal battle took center stage.

A full obituary will appear shortly.