MANCHESTER, N.H. ? Democrat Joe Lieberman, hoping to revitalize his presidential campaign with a fresh message and strategy, called Monday for a restructuring of the income tax code that would raise rates for the wealthy while cutting them for the middle class.

His campaign stalled in the second tier, Lieberman sought to reintroduce himself to voters with a stinging indictment of President Bush’s policies and character — and an economic plan that sets him apart from eight Democratic rivals.

“George Bush and his administration have taken our country far off track,” the Connecticut senator told several dozen supporters gathered on the sun-dappled banks of the Merrimack River. “Even worse, they lack the honor and integrity to acknowledge their mistakes, to change direction and to give our country the fresh start it deserves.”

Lieberman’s weeklong “Leading with Integrity” tour seeks to contrast his reputation for moral certitude — he was a leading Democratic critic of President Clinton’s affair with intern Monica Lewinsky — with what he says is Bush’s failure to keep his word.

In the 2000 campaign against the Gore-Lieberman ticket, Bush promised prosperity, corporate responsibility, fiscal discipline and cleaner skies. After the Sept. 11 terrorist attacks, Bush pledged to fully fund local homeland security programs and quickly bring peace to Iraq.

“My friends, you can’t fool all of the people all of the time,” Lieberman said. “The people are tuning in. And they are catching on to the consequences of the Bush administration’s lack of integrity.”