Unfortunately it's about actually making commercials the same loudness as the accompanying show, not less of those stupid Conservative advertisements.
http://www.vancouversun.com/business/dials+down+volume+commercials/4264024/story.html

Personally I thought they already dealt with this issue, and all the broadcasters just ignored it.

THat will work as well as the do not call list.

I'm fully in favor of this - in fact, one of the best features of my Pioneer receiver is to handle this automatically. It also fixes the problem of volume change when going from high def channels to standard def ones.