The Other Michael

<a href="http://www.senate.gov/senators/senator_by_state.cfm" target="_blank">List of Senators by state</a>

Scroll to your state (and it probably wouldn't hurt to hit the Senate leadership too) and the link will take you to an individual senator's website. Both Boxer and Feinstein's pages then had "contact" links that let me get a webform to send them a message.

cheers,
Michael