Many election analysts concluded that Senator Allen was unlikely to close the roughly 7,000 vote margin separating him from Mr. Webb, who has already claimed victory. And the Associated Press, a widely accepted authority for calling elections, agreed on Wednesday with Mr. Webb, declaring Mr. Allen, a Republican, the loser. A Webb victory gives the Democrats control of the Senate, with 51 seats.
A senior Allen adviser who spoke on condition of anonymity said on Wednesday that if the margin did not narrow significantly, Mr. Allen would not challenge the result.
“He has no intention of dragging this out,” the adviser said.