Why has Obama been going to Florida? The only reasonable answer is that he is looking not only at the snapshot numbers someone like Nate Silver does a good job of reporting, but the trend, way ahead of current polling. Campaigns are very numerate.
For the same reasons, Chris Christie and Michael Blomberg feel safe throwing Romney under the bus.
Regarding Christie, I'm willing to assume that his praise on Obama is genuine, and not calculated. Christie has had to deal with an enormous disaster, and I can easily see him being grateful if the President has, in fact, been very helpful.
For the same reasons, Chris Christie and Michael Blomberg feel safe throwing Romney under the bus.