News roundup: Sarah Palin coming to La. for Cassidy rally … As votes near, congressional authority to approve Keystone XL remains in question …  Jindal to appear on ‘Meet the Press’ Sunday

    Heading south: Sarah Palin travels to Louisiana this weekend to rally with Republican U.S. Senate candidate Rep. Bill Cassidy, as tea party backers line up for the GOP congressman in hopes of defeatin…

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