The New York Times reports that this overlap is resonating with voters. "Across New Hampshire, voters are reassessing the man they had all but written off six months ago," Michael Barbaro writes. "[F]or the first time, a solid majority of Republican voters in the state have a favorable view of the governor."
It's worth noting that Christie's favorability improvement is older than the Paris attacks. Quinnipiac University's national surveys showed a slow slide through 2014 for Christie bottoming out in July and rebuilding since. Even before the Paris attacks, Quinnipiac had Christie viewed slightly more negatively by all voters — but with a net favorability of +34 among Republicans. That's the sixth-highest — just above Trump.
Christie has seen a slight uptick in the polls since the Paris attacks — but only a slight one, and he was improving a bit anyway. Meanwhile, the front-runner (again Trump) has expanded his lead.
The dots on the graph indicate the end dates of individual polls. Christie's average support in the three polls that concluded after Paris is 5.3 percent. In the three polls prior to Paris, he averaged 6.
Nationally, the picture is the same.
A tiny uptick; not much change.
It has only been 11 days since the attacks in Paris, of course, but it has been 11 days with a lot of attention paid to foreign policy and responses to what happened. Momentum is important in politics, and maybe Christie is just starting to pick up steam. But if the Christie national security boomlet is actually reflected in the current polling, it's not much of a boomlet.