Barack Obama: “Research confirms that the most important factor in a student's success in school is a strong teacher.”

When we choose, when we make that decision, I do believe – and there is evidence for this – that the world gets incrementally better, and that is a worthy goal and it’s worth fighting for.

I’m going to insist that we can do better than we’re doing right now.

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

A drift towards extremism was "not inevitable