The fight to fill Barney Frank’s House seat will pit Sean Bielat, a Republican who challenged Frank two years ago, against Joseph P. Kennedy III, a Democrat and scion of the famous political family, after both won party primaries on Thursday. The race was one of a handful of Congressional primaries across Massachusetts that set the field for the November election. In two contested Democratic primaries, Representatives William R. Keating of Bourne and Richard E. Neal of Springfield both defeated challengers.
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