The fight for a Massachusetts U.S. Senate seat, and with it President Barack Obama's domestic agenda, is coming down to one essential challenge: maximizing turnout of core supporters.
Voters thronged to the polls early Tuesday morning. As dawn broke in the frosty Northeast, the GOP publicly relished the possibility that a previously obscure state senator, Scott Brown, could wrest the election from Democratic Attorney General Martha Coakley, considered the fly-away favorite until a week ago.
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