The Marin Report is a fast-paced, insightful look at the day's top news from renowned reporter Carol Marin. Watch it each weekday at noon.
Here are the stories we're following today:
• Nearly 1,000 runners from Illinois were registered to compete in the Boston Marathon. So far, none is believed to be among those injured by the twin blasts.
• Now among the many questions: Will anything change for the Chicago Marathon in October?
• The unanswered question of the moment is who is responsible for the explosions? In today's editorial, the Sun-Times' Tom McNamee urges restraint in a rush to judgment.
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