I wonder what this means:

"Mark my words. It will not be six months before the world tests Barack Obama like they did John Kennedy. The world is looking," Biden said.

"Remember I said it standing here. if you don't remember anything else I said. Watch, we're gonna have an international crisis, a generated crisis, to test the mettle of this guy. And he's gonna have to make some really tough -- I don't know what the decision's gonna be, but I promise you it will occur. As a student of history and having served with seven presidents, I guarantee you it's gonna happen," Biden continued.

He "guarantee"s it.  What have Obama and Biden been doing lately?