Mayor Michael R. Bloomberg, one of the most outspoken defenders of Wall Street, has sided against one of the financial industry’s biggest critics in a hotly contested Senate race in his native Massachusetts.

Mr. Bloomberg has agreed to host a fund-raiser at his Upper East Side town house for the re-election campaign of Senator Scott P. Brown, a Republican, who is being challenged by a fiery consumer advocate,Elizabeth Warren, a Democrat who is also a professor at Harvard Law School.

Mr. Bloomberg, through a spokesman, said his endorsement was not about Wall Street at all, but about his desire to reward Mr. Brown for voting against his party and the National Rifle Association on a gun control measure.

“If you take a tough stand and buck party orthodoxy that helps the City of New York, the mayor would like to support you,” Mr. Bloomberg’s spokesman, Stu Loeser, said Thursday.

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