It's far easier to get the attention of local media than the big networks. If you do a quick google search for "dream act" news articles you will see that most come from small, local newspapers or news shows, usually after a DREAM-related event. The more you become involved locally the easier it will be to get that kind of attention, it's about making friends with your local media people.

Also, don't forget about radio, I know that a group from CSUN in southern CA and a group from Santa Cruz each have a radio show or regular radio appearances in their local stations.

Hope that gives you some ideas.