Daily Caller has
"One intriguing notion, one intriguing thought here, and I’m curious, Mike, and I’ll ask Matt to weigh in as well,” Blitzer said. “It is a state holiday, in addition to the Boston Marathon. It is a state holiday in Massachusetts today called Patriots Day, and who knows if that has anything at all to deal — to do with these, these twin explosions.”
Patriots Day is a holiday meant to commemorate the anniversary of the Battles of Lexington and Concord, the first battles of the Revolutionary War. Blitzer continued to inquire to about that possibility, asking if there might have been an event to mark the anniversary.