Sorry, but that's just not true. Coulter dumped Christie in June of 2013.
But Christie's pro-amnesty positions were well-known as far back as 2010 when he said this: The president and the Congress have to step up to the plate, they have to secure our borders and they have to put forward a commonsense path to citizenship for people, source
Coulter promoted the pro-amnesty clown Christie for 3 full years while his positions were well-known. And she's as much a joke as he is.
I yield. I didn't even know who Christy was until he started beating up on a few school teachers.