"I raise money just like every other member of the Senate and Congress, including Professor Warren, so with all due respect that falls on deaf ears," he said Friday.
Brown called the decision to reject the oil subsidy bill "bipartisan," noting that several Democratic senators sided with Republicans.
Two Republican senators also sided with Democrats, including Olympia Snowe of Maine, who endorsed Brown at a Monday campaign event designed to highlight Brown's bipartisanship and support among women.
Brown and Warren are locked in tight race which could end up being the most expensive in state history.
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