Democratic U.S. Rep. Howard Berman with his wife, Janis, greet supporters at his campaign headquarter in Encino.

Democratic U.S. Rep. Howard Berman with his wife, Janis, greet supporters at his campaign headquarter in Encino. (Lawrence K. Ho / Los Angeles Times / October 27, 2012)

The fierce battle between Democratic Reps. Howard Berman and Brad Sherman for a San Fernando Valley congressional seat has surpassed the $13-million mark for spending, making it among the costliest House races in the country, according to new campaign finance reports.

The candidates have spent a combined $10.3 million through Oct. 17. Outside groups have poured an additional $3 million into the race between colleagues turned bitter rivals.

Federal election data also show New York City Mayor Michael R. Bloomberg's newly established "super PAC" spent more than $195,000 in an Inland Empire race this week to support California state Sen. Gloria Negrete McLeod of Chino over a fellow Democrat, Rep. Joe Baca of Rialto.

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-- Richard Simon, Los Angeles Times