It's mostly tribal nonsense, the same way a college student will wear a Che t-shirt knowing only that it's a vague expression of rebellion guaranteed to irritate his class enemies. A real Che would have blown that kid's brains out in La Cabaña. Whether Obama has any real Decemberists working for him - ay, there's the rub.
The Decembrists were a revolt by Czarist officers long before the Bolshevik Revolution. It took place around 1825.
The Decemberists