The Democratic Presidential Primaries

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With 10 months left until the first Democratic voter goes to the poll, has it all come down to just three out of eight presidential candidates?  Why are Clinton, Obama and Edwards getting all the attention? What are the prospects for one of them suddenly falling behind or for a dark horse to burst from the pack?  Plus, FBI Director Robert Mueller admits to misusing its powers under the Patriot Act and, on Reporter's Notebook, ethics for robots.