Inane public defender question

A previously uncharted depth of inanity is plumbed in this hypothetical from Yahoo! Answers:

The question is, what would happen if I was tried for murdered and I was truly innocent, but I had to get a public defender because I can't afford a lawyer to defend me, would I most likely be found innocent, guilty, or get a plea bargain. I was just carious the most likely outcome with a public defender. I hope I never get put in that type of situation because I know I can't afford a lawyer, so I'm guessing I would be screwed even if I was truely innoccent.

Enjoy the replies, and add your own!