Trayvon Martin's prosecutor did not lose this case because Martin was black, they did not lose because the jury hated him or because everyone in the judicial system was racist. A prosecutor must create an argument where the only conclusion is that the defendant is guilty, where there is no doubt what so ever that the defendant is guilty. We are all innocent until we are proved guilty, if the prosecution was not able to prove that Zimmerman was guilty without a shadow of a doubt, then the jury must find the defendant innocent. That's how simple it is. The prosecution didn't succeed, partly because they didn't do a very good job, but also because there was reasonable doubt right from the beginning that Zimmerman actually was telling the truth and he really was attacked by Martin, he had blood and cuts on his face and the back of his head. Did he hit himself in the face with his fists or smash his own head against the concrete? Was Martin really up to no good? What was he actually doing in the neighborhood? Why would Zimmerman not run if he really did kill Martin in cold blood?
In conclusion, don't say that this case is another example of racism in America, it isn't. This is our criminal justice system and if you want a different system, start talking about that, not about black vs. white. Our system works for what it was intended to do. Don't make this into more than it really is. Don't be dumb, do your own research, don't just regurgitate what you heard on some podcast or on the radio or read on some blog. Find out for yourself. Inform yourself and inform others.
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