Primary Election Results, US Missile Stockpiles Running Low, New Flu Vaccine

Votes in Michigan’s highly anticipated Democratic Senate primary are still being counted. But what do the results in Tuesday's other races tell us about November's election? The U.S military is running short of ammunition. NPR has learned that the Army is running out of long-range attack missiles. And the Food and Drug Administration is deciding whether to approve the first flu vaccine using mRNA technology.