( CNN ) -- The election victory of Massachusetts Sen.-elect Scott Brown is expected to be certified Thursday , which could allow him to be sworn in as early as Thursday afternoon to replace the late Sen. Ted Kennedy . Brown 's win stripped Democrats of their 60-seat , filibuster-proof majority in the U.S. Senate and raised fears among many congressional Democrats about a potential GOP landslide in November 's midterm elections . Brian McNiff , spokesman for Massachusetts ' secretary of state , said the final election returns from last month 's special election were delivered to the governor 's office Wednesday . Brown had asked for immediate certification . In a letter to Massachusetts Gov . Deval Patrick and Secretary of State William Galvin , Brown 's attorney says the Republican senator-elect had planned on being sworn in on February 11 , but he has been told that several Senate votes will be held before then . `` For this reason , he wants certification to occur immediately , '' attorney Daniel Winslow wrote .
Victory of Massachusetts senator-elect is expected to be certified Thursday . The Associated Press contributed to this report. Final returns from special election delivered to governor 's office Wednesday .