WASHINGTON (CNN) -- A Democratic takeover of the Senate is appearing more and more likely, after an ongoing canvass of votes in Virginia produced no significant changes in the outcome of the hard-fought race between Republican Sen. George Allen and his Democratic challenger, Jim Webb, sources told CNN late Wednesday.

A source close to Allen also told CNN that the senator "has no intention of dragging this out."

Meanwhile, a Webb aide told CNN that he plans a formal news conference Thursday to declare victory. Senate Democratic leaders also plan a news conference to claim a majority, according to a Democratic leadership aide. Wednesday night, with Webb leading by about 7,200 votes and the canvass in the Old Dominion about half complete, the Associated Press declared him the
winner in the race. CNN has not declared a winner.