For me, personally, the most difficult moments had to do with not just terrorist attacks, but also shootings.

I hope we can all agree that, instead of continuing to subsidize yesterday's energy sources. We need to invest in tomorrow's.

I'm especially grateful that they're here at a time when the rest of Ireland is focused on the final round of the Six Nations rugby tournament and the last match of the legendary Brian O'Driscoll.

Since I've been in the Senate, is that my work with people like Tom Coburn on opening up transparency in government, making sure that every dollar the federal government spends that's out there - that that's all posted on a searchable database on the Internet.

Losing the PR battles, particularly about healthcare, translated into losing his Democratic majorities in Congress, beginning with a Republican landslide in the midterm election of 2010.

These days, the House Republicans actually give John Boehner a harder time than they give me. Which means orange really is the new black.

I'm no longer just a candidate. I'm the President. I know what it means to send young Americans into battle, for I have held in my arms the mothers and fathers of those who didn't return. I've shared the pain of families who've lost their homes, and the frustration of workers who've lost their jobs.