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 .
Democrat Martha Coakley concedes to Republican Scott Brown . President Obama `` frustrated '' by Massachusetts Senate race , aide says . Good turnout expected as Massachusetts votes to fill Sen. Ted Kennedy 's seat . Democrats would lose filibuster-proof majority in Senate with Brown win .