Oil prices, democracy, autocracy, and nukes

Publius Pundit wonders, what will be the impact of falling oil prices on some those world leaders who sit atop of mountains of petrodollars:

World oil prices right now are dropping like a stone. If they go below $50 a barrel and stay there, Venezuela’s Hugo Chavez, Iran’s Mahmoud Ahmadinejad and Russia’s Vladimir Putin are in for hard times.