Nancy Pelosi is a Congressional Representative from California, and is currently Speaker of the House. Dianne Feinstein is one of two Senators from California.

Civics lesson (since you seem to have slept through civics classes in high school):   these two ladies are in the National Congress and National Senate. They are not currently involved in the legislature of the State of California.

How are they relevant to the current discussion about laws regarding same-sex marriage in California?

Don Firth