Not according to an article in the WSJ (this week?). The turnout rate of ex-cons is lower than the public in general, and those who do vote are somewhere around 70 - 80% Democrat (as I recall, I did not save the article), with the rest mostly R.
Dang! Contradictory reports, with numbers even. Sources, please, gentlemen? (FReepmail if you like -- I collect stats.)