For months, CBS News has been following the deepening troubles of tiny Postville, Iowa, population 2,200. Now the shutdown of the town's main employer following a federal immigration raid has Postville at the point of desperation... Postville, Iowa was just decorated with holiday cheer. But looks can be deceiving. "In the last few weeks - it's really gone downhill dramatically," says Mayor Bob Penrod. With empty streets - and shuttered shops - this small town is facing economic calamity. Penrod is taking steps this weekend to declare a state of emergency here - but not a natural disaster - rather...