The media filters your candidates for you, as usual. Here's a good example:
http://www.lewrockwell.com/blog/lewrw/archives/018764.html
Whatever you think of Paul, he came in 2nd place in NV. Yet the New York Times excludes him from coverage.
Not only that, he also has beaten Giuliani each time and has just about as well as Fred Thompson so far. Thompson and Giuliani are included in the coverage but Paul left out, clearly on purpose.
Great example of media bias.