Of course, US leadership on this issue is welcome.

There was a deep need for US moral leadership.

U.S. leadership on these issues will create jobs and keep America competitive.

This environment will also foster continued U.S. leadership in science.

Further, the judgment and credibility of senior U.S. financial leadership was called into question.

The need for stronger U.S. leadership and a sustained commitment from the international community is clear.

US leadership therefore is paramount through this transition.

They just felt this was a real sign of U.S. leadership.

That authority, he said, is "key to U.S. leadership in the world economy."

There's also the matter of U.S. leadership and toughness in a messy world.