This is just plain stupid. And Obama knows it.
The US voted against a resolution condemning the embargo against Cuba. OK. It was a condemnation aimed at the US. But the Obama administration knows - knows (and everyone with a scintilla of intelligence knows) that the embargo is a joke and harms the interests of the US, not to mention the investments that private firms (hotels, etc.) could make there and reap the rewards.
Every US ally in the world voted against the US except Israel (which, incidentally, has investments in Cuba). Bears worth repeating - every ally voted against the US. Obama and Hillary should have voted: abstain.