NEWTON — Democrat Joseph P. Kennedy III won a decisive victory tonight over Republican Sean Bielat, in the race to fill the open Congressional seat left vacant by the retirement of US Representative Barney Frank. With percent of the vote counted, Kennedy, the 32-year-old son of former US Representative Joseph Kennedy II and grandson of US Senator Robert F. Kennedy, led with percent of the vote in the redrawn 4th Congressional District, which extends from Newton to Fall River.
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