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He expressed defiance shortly after leaving the courthouse in Washington, vowing to press on with his campaign to win re-election to the Senate on Nov. 4 and to overturn a verdict he said was influenced by “repeated instances of prosecutorial misconduct.”

Even if Stevens wins re-election, his future is clouded.

Each charge carries a maximum of five years in prison, though sentencing guidelines call for a less harsh penalty.

If the verdict survives appeal, he could be expelled from the Senate if two-thirds of his colleagues vote to do so.

Meanwhile, Senate Republican rules require him to relinquish his position as the ranking member on the Appropriations Committee.

Stevens became a symbol of excessive government spending when he defended a pet project that came to be known as the “Bridge to Nowhere.” At the same time, his half-century in government, which predates Alaska’s statehood, endeared him to many of Washington’s most respected figures. Luminaries such as former Secretary of State Colin L. Powell and Sen. Daniel K. Inouye, Hawaii Democrat, testified on his behalf at the trial.

U.S. District Judge Emmet G. Sullivan said Stevens would be sentenced within 90 days.

Minutes after the verdict was read, Stevens left hurriedly with his attorneys in a van as a swarm of reporters and camera crews surrounded him. The jurors left the court without comment.

“The jurors have unanimously told me that no one has any desire to speak to any member of the media,” the judge announced in the courtroom.

Matthew W. Friedrich, acting assistant attorney general of the Justice Department’s Criminal Division, thanked prosecutors during a press conference in front of the court. “This has been a long and hard-fought trial,” he said.

During the trial, defense attorneys tried to portray Stevens as being too busy in Washington to pay close attention to the renovation of his cabin in Girdwood, Alaska, which his wife, Catherine, oversaw. They also said their client assumed that the $160,000 they paid to another contractor covered everything.

The prosecution relied on testimony by several VECO workers who, starting in 2000, labored for months to transform a modest A-frame cabin into a two-story home with wraparound decks, new electrical and plumbing systems, a sauna and a master-bedroom balcony.

Prosecutors called as their star witness Allen, VECO’s former chief executive who has pleaded guilty to bribery in a corruption investigation resulting in convictions of several Alaskan legislators.

“This company, the evidence showed, was not a charity,” Mr. Friedrich said at Monday’s press conference, referring to VECO Corp.

Stevens spent three days on the witness stand, vehemently denying the charges against him. He said his wife paid every bill they received.

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