WASHINGTON (CNN) -- Though no formal concession has been made yet in the Virginia U.S. Senate race, Republicans are resigned to facing a Democratic majority the chamber next year, one GOP member said Thursday.

"I think if you ask any Republican in Congress right now, they're working under the assumption that they'll be in the minority in both the House and the Senate," New Hampshire Sen. John Sununu told CNN.

In the last unsettled race of the 33 Senate contests on Tuesday's ballots, GOP Sen. George Allen trailed his Democratic opponent, Jim Webb, by 8,805 votes, the Virginia Board of Elections announced Thursday afternoon. The gap grew from the roughly 7,200 votes Wednesday after 55 of Virginia's 134 electoral districts completed their canvasses of the results.

A Webb win would put the new Senate lineup at 49 Democrats, 49 Republicans and two independents -- Bernie Sanders of Vermont and Joe Lieberman of Connecticut -- who have said they would caucus with the Democrats. That would give the Democrats the 51 votes they need to claim a majority for the first time since 2002.