Is this what you're talking about?
Here, from 2004.
As for Pakistan, Obama said that if President Pervez Musharraf were to lose power in a coup, the United States similarly might have to consider military action in that country to destroy nuclear weapons it already possesses.
He's not talking about a nuclear strike, he's talking about disabling potentially rogue nuclear capability.
If you have information indicating that Obama was actually talking about a nuclear strike, can you post it?
