Barack Obama opens up to CBS's Harry Smith about why he's suspending his campaign at the most crucial time in order to go see his sick grandmother. This is some pretty powerful stuff.

Harry Smith: You've said in the past that you regretted - your own mother's illness - and her death came so quickly. You didn't have time to get back to see her. Barack Obama: Yeah, got there too late. ... We knew - she wasn't doing well. But you know, the diagnosis was such that we thought we had a little more time, and we didn't. And so I want to make sure that I don't - I don't make - the same mistake twice.

Andrew Sullivan puts it perfectly: