Barack Obama: “Our campaign is building a grassroots movement for change, and I don't just want Iowans' support - I want their ideas.”

If I had a blame pie for why politics is so polarised and why we're seeing a rise of populism in many places, it's because of that information that is going into our brains every day.

And I will fight for that, even if I don’t always think it’s going to win.

Use that hope to make a difference. Get involved.

I think when we act on that basis, it doesn't always work out, but over time things do get better.