can a inmate ask for clemency if he has a sex offense charge and what are their chances?

It is every inmate's right to ask for clemency. If you have a drug offense and are in the federal BOP, Obama was giving out clemency tickets by the hundreds. There have been zero for sex offenders. The states also offer a way to apply to their governor for clemency. These are long, long shots for success. Long sentenced drug criminals have had a lot of attention from the Obama Administration - he has pardoned or granted clemency to more offenders than all the previous 44 US presidents combined.