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Sen. Feinstein to undergo knee surgery Wed.

California Senator Dianne Feinstein is seen in this undated file photo.

January 4, 2011 12:00:00 AM PST
California Senator Dianne Feinstein is about to have knee replacement surgery.The 77-year-old is scheduled to have the operation Wednesday in San Francisco.

She says she's needed the operation for a while to relieve pain.

Feinstein won't be able to travel for about three weeks following the surgery.

She says she plans to work from home.