The made-in-Hollywood marriage of Ronald and Nancy Reagan is more than a love story-it's the partnership that made him president. Of the pair, Nancy was the one with the sharper instincts about people, the superior radar for trouble, and the keen sense of how to secure his place in history. The only person in the world to whom Ronald Reagan felt truly close, Nancy understood how to foster his strengths and compensate for his weaknesses. Neither timid...