Usually, I'm pretty good about sorting through the options and then making decisions that I'm confident are the best decisions in that moment, given the information we have. But there are times where I think I wish I could have imagined a different level of insight.

Poorly secured nuclear material in the former Soviet Union, or secrets from a scientist in Pakistan could help build a bomb that detonates in Paris. The poppies in Afghanistan become the heroin in Berlin. The poverty and violence in Somalia breeds the terror of tomorrow.

Ultimately, peace is just not about politics. It's about attitudes; about a sense of empathy; about breaking down the divisions that we create for ourselves in our own minds and our own hearts that don't exist in any objective reality, but that we carry with us generation after generation. And I know, because America, we, too, have had to work hard over the decades, slowly, gradually, sometimes painfully, in fits and starts, to keep perfecting our union.

Filibuster has long tradition, but used to harm civil rights.

Here in Europe some of the challenges have to do with structures that are so complicated. You've got Brussels, and you've got parliament, you've got councils and then you've got national governments. So people sometimes don't feel as if they know who's making decisions, and the more that we can bring people in and engage them, the better. Some of it is also cultural and social, people's sense of identity.

Each side has legitimate aspirations - and that's part of what makes peace so hard. And the deadlock will only be broken when each side learns to stand in the other's shoes; each side can see the world through the other's eyes. That's what we should be encouraging. That's what we should be promoting.

America is a nation of immigrants. And so the question is, how do we make legal immigration faster, less bureaucratic, cut the red tape?