From CNN:

• Percentage of Americans who have a favorable opinion of Laura Bush: 73%
• Percentage of Americans who have a favorable opinion of George Bush: 46%
• Percentage of Americans who have a favorable opinion of Dick Cheney: 41%
• Percentage of Americans who have a favorable opinion of Donald Rumsfeld: 42%

I would like to see numbers on the approval ratings of other presidents' spouses. I'm guessing Hillary's weren't near that high when Clinton was in office. And Nancy Reagan was unpopular in the early years of her husband's administration. I have a hypothesis: The popularity of the First Lady is inversely proportional to the popularity of her husband.

If someone can show me some numbers to prove me right or, you'll get a prize.