I think Nagin got the message after he made his now infamous radio address and Bush had a private meeting with him afterward. I'd have loved to have been a fly on that wall. Bush probably told him that his "eat, drink and be merry, for tomorrow we die" philosophy has come full circle. Guess what, Nagin--it's "tomorrow".
Actually Bush met with both Nagel and Blanco at the same time. It was in front of Nagel that Bush said the Gov was asking him for 24 hours to decide, He had offered immedeate deployment of troops and she "needed 24 hours"