In Mass. Senate race, a battle for union votes

BOSTON (AP) -- Republican incumbent Scott Brown and Democrat 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 official backing of the AFL-CIO and has appeared with union activists on the campaign trail, Brown is courting rank-and-file workers while scooping up his own series of endorsements, many from police organizations.

Brown is facing more than just a battle of endorsements.

The AFL-CIO's support of Warren brings with it a small army of campaign workers and financial support. The group has already helped flood voters' mailboxes with flyers promoting Warren.

Brown has reason to hope his message is resonating too.

AFL-CIO officials acknowledge nearly half their members voted for Brown in the 2010 special election when he won the seat.