When Eli Attie, a writer for “The West Wing,” prepared to plot some episodes about a young Democratic congressman’s unlikely presidential bid, he picked up the phone and called David Axelrod.

Mr. Attie, a former speechwriter for Vice President Al Gore, and Mr. Axelrod, a political consultant, had crossed campaign trails before. “I just called him and said, ‘Tell me about Barack Obama,’ ” Mr. Attie said.

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