US Senate candidate Elizabeth Warren, in yet another retooling of her campaign advertising, is throwing a punch at her Republican rival, Senator Scott Brown, using a famous Lowell boxer’s trainer to accuse him of “siding with the big money guys’’ and large corporations. The 30-second ad is set in the West End Gym and features Micky Ward’s trainer Art Ramalho, who accuses Brown of working against the interest of working people. ‘’We can spot the real fighters here in this gym.”
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