Feb 28 2012 21 mins 4
Tuesday: Two of the students critically wounded in the high school shooting rampage in Chardon, Ohio, have died, raising the death toll to three; Also, Mitt Romney is in danger of losing the Michigan primary to Rick Santorum. So, what happens if Romney loses in his home state?; And, oceanographers meet in Hawaii to discuss when and where the millions of tons of debris from Japan's tsunami will wash ashore in North America.
