Washington ? Democrats completed an improbable double-barreled election sweep of Congress on Wednesday, taking control of the Senate with a victory in Virginia as they padded their day-old majority in the House.

“The days of the do-nothing Congress are over,” declared Democratic Sen. Harry Reid of Nevada, in line to become majority leader. “In Iraq and here at home, Americans have made clear they are tired of the failures of the last six years.”

Jim Webb’s victory over Sen. George Allen in Virginia assured Democrats of 51 seats when the Senate convenes in January. That marked a gain of six in midterm elections in which the war in Iraq and President Bush were major issues.

Earlier, State Sen. Jon Tester triumphed over Republican Sen. Conrad Burns in a long, late count in Montana.

With a handful of House races too close to call, Democrats had gained 28 seats, enough to regain the majority after 12 years of Republican rule and place Rep. Nancy Pelosi of California in line to become the first female speaker in history.

Allen’s campaign issued a statement noting that state officials are conducting a canvass of the votes cast in Tuesday’s balloting.

“At the conclusion of those efforts, Senator George Allen plans to make a statement regarding the outcome,” it said.

Barest of majorities

The Senate had teetered at 50 Democrats, 49 Republicans for most of Wednesday, with Virginia hanging in the balance. Webb’s victory ended Republican hopes of eking out a 50-50 split, with Vice President Dick Cheney wielding tie-breaking authority.

The Associated Press contacted election officials in all 134 localities in Virginia where voting occurred, obtaining updated numbers Wednesday. About half the localities said they had completed their postelection canvassing and nearly all had counted outstanding absentees. Most were expected to be finished by Friday.

The new AP count showed Webb with 1,172,538 votes and Allen with 1,165,302, a difference of 7,236. Virginia has had two statewide vote recounts in modern history, but both resulted in vote changes of no more than a few hundred votes.

It had been clear for weeks leading up to the election that Democrats were strongly positioned to challenge Republicans for House control.

But Democrats began the year with fewer seats than at any time since Herbert Hoover occupied the White House. Even Reid, the Senate’s party leader, mused aloud at one point that it might take a miracle to capture Senate control.

“From changing course in Iraq to raising the minimum wage to fixing the health care crisis to making this country energy independent, we’re ready to get to work,” he said in a statement late Wednesday.

Earlier, Sen. Mitch McConnell, R-Ky., all but certain to become the next minority leader, said: “In the Senate, the minority is never irrelevant unless it falls down into the very small numbers. I don’t think, as a practical matter, it’s going to make a whole lot of difference in the Senate, being at 49.”

Hastert steps aside

With the GOP booted from power, lame-duck Speaker Dennis Hastert, R-Ill., announced he will not run for leader of House Republicans when Democrats take control in January.

“Obviously I wish my party had won,” Hastert said in a statement that added he intends to return to the “full-time task” of representing his Illinois constituents.

Overall, Republicans lost ground with swing voters such as Catholics, independents, Hispanics and suburbanites, according to exit polls conducted for the AP and the television networks. The GOP held its conservative base, but Democrats made inroads with moderates.