Massachusetts Governor Deval Patrick is expected to certify Brown's upset victory over Democrat Martha Coakley on Thursday, clearing the way for him to enter the Senate, aides said.
Brown will become the 41st Republican in the 100-member chamber, eliminating the Democrats' 60-seat supermajority that is needed to overcome procedural hurdles on important bills such as healthcare reform.
(Reporting by Richard Cowan; Editing by Xavier Briand)

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