mcvey, a single interest, lone interest type of individual, whether it's someone radicalized, whether it be political or religious. al, it would be easy for one person to do it. easier for two. no evidence of a larger group involvement whatsoever. and al, these bombs are so delegate that they were likely assembled in the same immediate area otherwise, the bomber could have blown them up driving from point a to point b. >> thank you for joining us a. passionate president obama slamming the shameful republicans who voted against 90% of the court. plus, new incredible stories of survivors from the boston attacks and the heroes who saved them. stay with us.