Palin to replace Couric?   Only if she tests well and gets a very long term contract.  She cannot afford to fail while train wrecks have become commonplace at ratings challenged CBS.  Don't forget that the people in the entire news division are at fault for Couric's demise and the hard core establishment Libs in the newsroom at CBS will do their best to sabotage the GOP hottie should she dare bare her useless right wing ass on sacred liberal ground where busts of Alger Hiss and Jane Fonda still hold places of honor in the lobby.