Go to someplace like
http://news.google.com/ (or the bing news site, yahoo, etc)
Type in Homeless Man
See what you get.
Then type in Homeowner, or other words similar.
Try Unemployed - note the type of stories you see (words like help, fear, distress, crisis) and then compare it to words like employed, working, etc
Type in wealthy and note the other keywords in the headlines you find (some I came up with on first page, cutting taxes, Children Who Learn Self-Control Become More Successful, Wealthy , etc and so on).
Alone this may not mean a lot, but after time people will see over and over that people of a certain income, race, gender, etc are linked (at least in the media) are connected to other negative words. Few cover stories about a homeless person who does something positive, but there will be lots of stories of corporations helping out folks by fund raisers etc - even if said corporation does 100x as much negative.
Pick some words or phrases, search news sites - you will certainly find some positive and negative on both sides of the coin, but what percent of the total do they represent?
Pick some words, go through a few pages of stories, and if you can let us know what you get (although one day of stories is not a lot to go on, I do this everyday for words like bans, homeless, proposes, etc - as a side note, I don't ever see many stories about bans being lifted...but that is for another thread).