The retirement of US Representative Barney Frank leaves an open seat in the Fourth Congressional District, which stretches from Brookline to Fall River. The candidates in Thursday’s Democratic primary are Joseph P. Kennedy III, the latest from the storied political family to cast his hat in the ring; Herb Robinson of Newton; and Rachel Brown of Brookline. The Republican ticket includes Sean Bielat, the Norfolk businessman who challenged Frank in 2010; Brookline psychiatrist Elizabeth Childs; and Fall River dentist David Steinhof.
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