[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/11/06/art.smith.ap.jpg caption="Gordon Smith has conceded defeat."](CNN) - Oregon Sen. Gordon Smith has conceded defeat to Democratic challenger Jeff Merkley in his re-election bid, CNN has confirmed.
Smith personally called Merkley earlier Thursday to concede the race, according to Merkley spokeswoman Julie Edwards. Smith is also expected to publicly admit defeat in a press conference later Thursday.
Election Center: Check out the results in Oregon
With 100 percent of the counties reporting, Merkley received 48.4 percent of the vote to Smith's 46 percent.
Smith's defeat means Democrats now hold 57 seats in the Senate. The outcomes of three races remain unclear - Alaska, Minnesota, and Georgia.