Don't really see a big deal here for BB...
I mean, they're only "testing" alternatives. That doesn't mean that they'll win out over Blackberry in the end. Tests can and do fail.
I see the "apparent" Apple snub in a similar light. It could also be that these tests are solely to check the appropriateness of Samsung, LG, etc., for use by the White House. Just because they're said to be testing "X"... that doesn't mean that "Y" had failed to get a nod or wasn't being considered.
Besides, its never a good thing to put all one's eggs in one basket, not so?
Paris, cuz apparently the English language is confusing!