Leave it to radio star Martha Zoller to sum up the need for radio independence this Independence Day. Zoller, writing a timely piece for the Business & Media Institute, gives a brief history of the rise of talk radio and a true free market of ideas.Thanks to the left and people like Nancy Pelosi, our ability to have media outlets give other than the liberal party line is jeopardized. It is one of the greatest threats to our freedom this July 4th.Martha, a veteran talk host, sums up the issue nicely. The reason talk radio leans to the right is "because conservatives are so under-represented in the rest of the media market."That's the way the left and the media like it. Read what she has to say. It's a good way to celebrate your freedom -- while you can.