Obama has the power to grant clemency to any federal prisoner. Presidents generally do. Not thousands of them. That's never been done before. Likely all it means is a rearrest in a very short period of time.
Even though obama grants clemency the law under which they were convicted hasn't changed. Without congressional action these felons can be rearrested. Under a different president they might not be so lucky.
Even though obama grants clemency the law under which they were convicted hasn't changed. Without congressional action these felons can be rearrested. Under a different president they might not be so lucky.