My clock, cigarette lighter, cd player and now my radio is going out what could be the cause?

I have a 2003 Mitsubishi Eclipse and over the course of a few months things have been going out. First my digital clock went out, next the cigarette lighters, then the disc changer and now my radio is playing out. Can anyone tell me or point me in the right direction of what can be the cause; i checked all the fuses.