One of their newest songs is about immigration. It's called Immigrandiana (We're Comin' Rougher). The message is strong and very important in what is happening in the US today. Here is a link to the video. http://www.youtube.com/watch?v=5oioNZSPqRM
Serj Tankian- The Unthinking Majority from the album Elect The Dead (great lyrics).
I can't embed (embed is disabled by YouTube), but here is the link to watch the video and listen to the song. For those of you politically conscious, listen to the lyrics.