Washington (AP): A senior Republican senator cannot move his corruption trial from Washington to his home state of Alaska, a federal judge has ruled in a decision that could hamstring the powerful lawmaker's re-election bid.

The patriarch of Alaska politics, Stevens could normally expect to coast to his seventh full term in the Senate. But Democrats want to capitalise on the lengthy FBI investigation and trial to capture the once-safe Republican seat.

Stevens, 84, had hoped to stand trial by day and campaign on nights and weekends. In a state where he is known as "Uncle Ted," he could have faced a more sympathetic jury. Stevens was named the Alaskan of the Century in 2000, the Anchorage airport bears his name, and he has brought billions in federal aid to the frontier state.

Yesterday's ruling puts a damper on his campaign plans. Stevens asked for, and received, an unusually speedy trial that he hopes will clear his name before voters go to the polls November 4. But with the trial in Washington, Democrats will have the state largely to themselves while Stevens is tethered to a defence table in the weeks leading up to the November election.

"He must have decided it's more important to get a speedy trial than to have all those days free to campaign," said Julie Hasquet, a spokeswoman for Anchorage Mayor Mark Begich, the front-runner for the Democratic nomination in the race.

US District Judge Emmet Sullivan said he would consider holding court only four days each week to make it easier for Stevens to fit in campaign trips to Alaska. But that could delay a verdict.

"We want the verdict as far on this side of Election Day as possible," said defence attorney Brendan Sullivan, no relation.