Obama invoked a speech Lincoln gave at this same spot in 1858 condemning slavery--"a house divided against itself cannot stand"
What's amusing is that the collapsing house quote is attributed solely to Abraham Lincoln, when in fact Lincoln himself was quoting the words of Our Lord Jesus Christ as recorded in the Gospels of Matthew 12:25, and Mark 3:25.
Of course, let's be realistic. Who would expect the NYT, Adam Nagourney, Jeff Zeleny, or even Barack Obama, to know that?