Agree with what taintedpaint says.
When you commit a crime, you make a consious (sp!) descision to face the consequences should you be caught. If that includes losing the right to vote, then so be it.
Imo, if you take away someone elses human rights, by taking their life, their possesions, by injuring them, etc, then you can't expect to keep your rights as they were before you comitted the crime.
Food, shelter, healthcare, and a life free from harm by others are human rights. Voting is not a human right. If it were that important, sane people would not choose to give up that right because they can't be arsed to go to the polling station.
Freedom is a bigger human right than voting, but nobody's suggesting that criminals shouldn't be locked away, so why is their right to vote so important?