Washington (CNN) -- Republican Scott Brown lost his second Senate race in two election cycles on Tuesday, as Democratic Sen. Jeanne Shaheen defeated him to win a second term, according to a CNN projection. Shaheen said late Tuesday night that Brown had called her to concede, and praised him for a "vigorous race." The race represented Republicans' best chances at picking up a Senate seat in the Northeast -- one that was vital for Democrats to protect as they faced majority-threatening challenges elsewhere. Over the summer, Brown used a series of crises to nationalize the race -- arguing that President Barack Obama and, by extension, Senate Democrats like Shaheen, are unable to govern effectively.
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Democratic Sen. Jeanne Shaheen won a second term, defeating GOP challenger Scott Brown
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Brown previously represented Massachusetts in the Senate, but lost re-election in 2012
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Brown had tried to nationalize the race, focusing on Obama's handling of Ebola, ISIS and immigration
@placeholder, meanwhile, turned to core Democratic economic issues and issues affecting working class voters and women.