Attempted to write to one of my senators. To do so online requires using the web form on the senator's "contact" page. It says only messages from the senator's constituents will be accepted, so it's necessary for the author to share some identifying info.<p>I don't know how much checking is done to assure the writer really is a constituent, probably there's some lookup of street addresses, zip codes, etc.<p>Main point is that the senator's contact page does use https. This is appropriate given that personal info is shared per the contact form. I don't think any other senate pages accept input, so maybe their reasoning is that http vs. https is less critical on other parts of the site.