[snowrip]

That security detail and vest were at the behest of the FBI, who was investigating what they described as several “credible threats” against Beck’s life and the lives of his family members.

There was no shark-jumping.

[DTogo]

It's also been stated here that his wife asked him to wear it.

A couple years ago Glenn was aghast on his radio show about how Sarah Palin travels with NO security (or vest).