US Senator Scott Brown Thursday boarded a massive blue bus emblazoned with an image of the senator in his barn jacket, setting off on a road trip to rally supporters at stops in Milford, North Grafton, Framingham, North Billerica and Wakefield. But the bus was also a target for Brown’s opponent, Democrat Elizabeth Warren, who in a new radio ad lampooned Brown for taking the tour rather than agreeing to reschedule a long-planned debate postponed due to Hurricane Sandy.
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