POTUS has the right to issue pardons and commute sentences. It is expected that the right is used sparingly and for good cause. Three days out from leaving office President has commuted back to seven years the 35 year sentence imposed on Chelsea Manning. 'She' will now be freed in less than four months.
On 30 July 2013 Manning was convicted by Courts Martial on 17 out of 22 charges including five charges of espionage and theft. Evidence was adduced that the information passed by Manning to Wikileaks caused considerable damage to the US intelligence community and contributed to the unmasking of vital intelligence assets.
Sorry President Obama ... you don't commute the sentences of traitors ... especially traitors in uniform no matter how mixed up they are.