Maybe this will explain things:

He has two daughters with his first wife, Julia Thorne, whom he married in 1970. They separated in 1982 and were divorced in 1988. Kerry married Teresa Heinz, widow of ketchup heir Sen. John Heinz (R-Pa.), in 1995.

In 1997, Kerry, a Catholic, obtained a church annulment of his first marriage. His ex-wife, who supports him politically, said the proceeding was "disrespectful" but she didn't fight it.

The Boston Globe quoted sources as saying that Teresa Heinz wanted the annulment because she is a devout Catholic and couldn't participate fully in church ceremonies if she was married to a divorced Catholic.

Also, there is an interesting Kerry Timeline at the Boston Globe.

kat