john f. kennedy had not been assassinated? would he have won re-election? would he have achieved the same landmark civil rights victories as his successor? those are some of the questions posed by jeff greenfield in his latest book "if kennedy lived." jeff, congrats on the book. >> thank you. >> perhaps maybe in response to some of those questions you write in the book, a detached, dispassionate president might not have had the commitment to fight hard for a civil rights bill or commit the nation to, quote, war on poverty. that same approach might have prevented a president from escalating a war out of a refusal to be the first president to lose a war, as lbj once famously put it. you think maybe not as good on civil rights, better on vietnam. >> if you're doing this at mat history not as a sci-fi thing, what you do in a sense is you learn as much as possible from oral histories, from documents, from assessments, and in effect