He'll just waffle and say he signed the letter because he didn't want a constitutional amendment that could potentially ban civil unions as well.
This very weak argument by Kerry that will not fly in the Heartland.
Remember that he said that he is against the "Federal Constitutional Amendment to ban gay marriage and he will leave up to individual state to decide on this issue. However in this 2002 letter he is clearly interfering to prevent the "Massachusetts State Legislature" from changing the Massachusetts constitution to ban Gay marriage!!!