A new poll shows Massachusetts Democrat Elizabeth Warren has opened up a six-point lead over Republican incumbent Scott Brown in the U.S. Senate race that could help determine which party controls the upper chamber. Warren attracts 50 percent of the support from likely voters in a new WBUR survey released Wednesday. Brown garners 44 percent of the support, while 4 percent remain undecided. Warren’s lead falls outside the poll’s margin of error. It also signals a significant change in the race: Earlier this month, the survey showed Brown ahead by four points. Warren now...

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