9/20: Romney camp shifts tactics; biologist fights to restore coral reefs

      |After a rough two weeks for Mitt Romney, the GOP presidential nominee's polls numbers have slipped in key swing states. And, as Jan Crawford reports, that's prompting the Romney campaign to shift tactics; And, a new report says that climate change will damage 70 percent of the world's coral by 2030. Elaine Quijano speaks - underwater - with a marine biologist who has developed a way to save the coral.

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