BOSTON (AP) — Republican incumbent Scott Brown and Democratic challenger Elizabeth Warren are honing their campaign pitches to union workers as they scrap for every vote in Massachusetts’ U.S. Senate race. While Warren has the backing of the AFL-CIO and has appeared with union activists on the campaign trail, Brown is courting rank-and-file workers and scooping up his own endorsements, many from police organizations. Brown is facing more than just a battle of endorsements, however. The AFL-CIO’s support of Warren brings with it a small army of campaign workers...

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