Many countries allow inmates to vote. Examples include Australia, Canada, the Czech Republic, Denmark, France, Israel, Japan, Kenya, Netherlands, Norway, Peru, Poland, Romania, Serbia, Sweden, and Zimbabwe. In Germany, the law even calls on prisons to encourage prisoners to vote. Only those convicted of electoral fraud and crimes undermining the "democratic order", such as treason are barred from voting, while in prison.[12] In Australia, where compulsory voting is practised, the High Court of Australia in 2007 found that the Constitution enshrined a limited right to vote, which meant that citizens serving relatively short prison sentences cannot be barred from voting.

http://en.wikipedia.org/wiki/Felony_disenfranchisement