Truth be told this could be filled with post-punk music, such as the following
This Heat-Deceit
The Clash-First 5 albums
Minutemen-Double Nickels On The Dime
The Specials-S/T, More Specials, Ghost Town EP
The Jam-All Mod Cons, Sound Affects
U2-War,The Joshua Tree

And how could I forget these beauties?
http://ecx.images-amazon.com/images/I/61xkHjcSkbL.jpg
Toxicity-System Of A Down
http://www.amiright.com/album-covers...n-Nebraska.jpg
Bruce Springsteen-Nebraska

Think how many of those albums are anti-Reagan or Thatcher in some way. Is it a failing of our era that music wasn't sufficently used to criticise the status quo?

The best political albums are the ones I don't notice as being overtly political.

If I do notice it (e.g. Penis Envy or Entertainment) It just feels preachy & irritates the crap out of me.

I think The Specials 2 albums are a perfect example of how you can be political without it being a distraction from the music.

Anti-Flag - All of the albums
Bad Religion - Same

http://massmc.com/image/reviews/herd-summerlands.jpg

One of my favourite hip hop albums period. It does have a heavy political focus, and might sound preachy if I wasn't so onside with their message. One of my favourite punchlines of all time is still, "Crook, you got your arse played in mandarin.", and that isn't because it's particularly witty - but I just ****ing hated John Howard.

http://img300.imageshack.us/img300/7961/2155304.jpg

I always like to describe these guys as a jazzy version of Rage Against the Machine. I'm not quite as radical as these guys, but the music is great no matter what. And unlike others I don't really find political slants to annoy me.

Nebraska is a damn good choice.