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Other Republicans mentioned as possible Senate candidates include Wisconsin Attorney General J.B. Van Hollen, former U.S. Reps. Mark Neumann and Mark Green, state legislative leaders and brothers Scott and Jeff Fitzgerald, and former state Sen. Ted Kanavas.

Possible Democratic candidates for the Senate seat include Mr. Feingold, U.S. Reps. Tammy Baldwin of Madison and Ron Kind of La Crosse, and Milwaukee Mayor Tom Barrett.

Henry C. Jackson reported from Washington.