I guess there were things about the Obamas I discovered that I do think are universal to marriage. I found it very interesting in my reporting that their most difficult periods in the White House almost never seemed to coincide. When one was down, the other one was holding it together. In my experience, that's true of marriage generally.

'The White Princess' follows Princess Lizzie, who was forced into marriage with Henry Tudor. It's kind of about how their marriage united the Yorks and the Tudors - the two families do rival but have to unite.

Interpreting anyone's marriage - a neighbor's, let alone the president's - is extremely difficult. And yet, examining the first couple's relationship - their negotiations of public and private life, of conflicts and compromises - offers hints about Barack Obama the president, not just Barack Obama the husband.

Marriage Quotes