congressional blogs??

Besides John Conyers (D-MI), have any congressman activly delved into the blogging community? I know blogs arise all the time during campaigns, but wouldn't it be cool for a congressional office to operate a blog as well. Constituents could get either both snail mail letters as well as email updates from their congressmen and senators and would be able to respond either way (obviously i know you can email your congressman now). However, by adding a blog to the equasion, a lot more citizens would participate in contacting their representatives and senators if they got email updates with a link to a blog where they could post their opinions. Not only would it increase participation, but would give our public officials a much better idea of what many constituents are thinking.