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Dauman choice exposes a rift at Viacom

Dauman choice exposes a rift at Viacom

The new king of the Viacom Inc. media empire was named to replace ailing founder Sumner Redstone, but the move exposed a boardroom rift that could play out in the ultimate struggle for control of prized assets that include Nickelodeon, MTV and the legendary Paramount Pictures.

The Viacom board voted 10 to 1 Thursday to name Chief Executive Philippe Dauman, 61, as chairman of the media company, resolving for the moment the question of who would replace Redstone, the 92-year-old controlling shareholder.

The lone vote against Dauman came from Redstone's daughter, Shari Redstone, the board's vice chair. That puts Shari Redstone, 61, at odds with the new chairman, her fellow...