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Challenging leaders is as American as it gets.

Personally, I'd like to see more of our leaders take a technocratic approach to solving our biggest problems.

In the United States Senate, we cannot do great things without reaching across the aisle and working together - and I look forward to the challenges ahead.

We must recognize that as the dominant power in the world we have a special responsibility. In addition to protecting our national interests, we must take the leadership in protecting the common interests of humanity.

There is no international problem that can be addressed or solved without the engagement and leadership of the United States and everybody in the world knows that, its just fact of life. So sometimes I think we could conduct ourselves with a little more humility.

As a world leader, America must be prepared to confront any challenge.

I do think our challenge is to balance credibility and a clear message about how we would reduce the deficit with boldness about the choices that we put before the public.

Together, we will determine the course of America and the world for years to come. We will face challenges. We will confront hardships. But we will get the job done.

We have a number of challenges ahead of us.

Global challenges require collective responses.