At 50 min­utes to air­time, the Rev. Al Sharpton, in pin­stripes and cuf­flinks, was sit­ting in his office at Rock­e­feller Center, tin­kering with Tuesday’€™s intro­duc­tion to “€œPol­i­tic­sNa­tion,”€ his new nightly show on MSNBC.

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