By Ezra Klein

1) It was going to be a long day. It was important to pack snacks.


(John A. Kouns)

2) And to stay cool.


(AP)

3. Look at how many people were there.


(Bruce Davidson / Magnum Photos)

4) Seriously. So many people.


(Everett Collection Inc. / Alamy)

5) No caption needed.


(AFP/Getty Images)

6) What Lincoln saw.


What Lincoln saw. (James K. W. Atherton / UPI)

More great photos here.