Martha Stewart has taken on a new cause — prison reform. Stewart, who is serving a five-month sentence for insider trading has posted a holiday message on her website urging her fans to take up the issue of prison reform. She writes, “I beseech you all to think about these women — to encourage the American people to ask for reforms, both in sentencing guidelines, in length of incarceration for nonviolent first-time offenders, and for those involved in drug-taking.”