In explaining why President Obama didn't call the Boston bombings a "terrorist attack," former adviser David Axelrod said, "I'm sure what was going through the president's mind is -- we really don't know who did this -- it was tax day": "The word has taken on a different meaning since 9/11," Axelrod said of the phrase "terrorist attack." "You use those words and it means something very specific in people's mind. And I'm sure what was going through the president's mind is -- we really don't know who did this -- it was tax day. Was it someone who was...