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The four-term Arizona senator's huge investment and hardened positions on issues like immigration have put him on a path that seems to head toward wins in next Tuesday's GOP primary and the November election.

San Diego's history as a gem mining and gem producing center is one of the county's best-kept secrets. The new exhibit called ALL THAT GLITTERS at the San Diego Natural History museum uncovers those sparkling secrets. We'll speak with the exhibit's curator and the owner of a present-day gem mine in San Diego.

The Government Accountability Office report on 15 for-profit colleges earlier this month found that all 15 misled students and four engaged in fraudulent behavior. We look at the role of for-profit colleges in the U.S. educational system; the findings of the report and what questions students should be asking when they enroll.

Blood Diamond