News roundup: Obama goal for quick revamp of NSA program may be unworkable, officials fear … Experts say Target hackers will be tough to find … Buffett offers $1B for perfect March Madness bracket

    Insider
    Doubts surfacing: U.S. officials directed by President Obama to find a way to end the government's role in gathering Americans' phone records are deeply concerned that there may be no feasible way to …

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