Democrat Martha Coakley concedes to Republican Scott Brown . President Obama ` ` frustrated '' by the Senate election , he says . Republican Scott Brown won a major upset victory in Tuesday 's special election for the U.S. Senate seat formerly held by liberal Democrat Ted Kennedy . Good results expected as Massachusetts votes to fill Sen. Ted Kennedy 's seat . Democrats would lose filibuster - proof majority in Senate with Brown elected .
Democrat Martha Coakley concedes to Republican Scott Brown . President Obama ` ` frustrated '' by the Senate election , he says . Good results expected as Massachusetts votes to fill Sen. Ted Kennedy 's seat . Democrats would lose filibuster - proof majority in Senate with Brown elected .